tonight on nigh line. taking hostage of a 7-eleven. a standoff with a woman lies in the balance. we're going inside the mind of a hostage negotiator. with seconds to make the call, do you pull the trigger? >> these are huge, right? >> they call it a magic stone. green fire from the mountains of colombia, where few dare to go. >> do you hear that dynamite? let's get out of here. plus, raid on bieber. justin bieber's mansion searched in the wake of an egg assault on a neighbor's house. the shocking discovery police

made inside. we have the latest on the investigation. [dad] [laughs]u [boy] mom! [mom] yes? [boy] whoa,whoa,whoa... [mom and dad] [laughing] [boy] whoa,whoa,whoa... [mom] you've got two left feet,boo. i just served my mother-in-law your chicken noodle soup but she loved it so much... i told her it was homemade. everyone tells a little white lie now and then. but now she wants my recipe [ clears his throat ] [ softly ] she's right behind me isn't she? [ male announcer ] progresso. you gotta taste this soup. [ male announcer ] you say tomato. ♪

old el paso says diced tomato stand 'n stuff chicken tacos. ♪ you say what's for dinner? old el paso says start somewhere fresh. good evening and thanks for joining us. the scene unfolding yesterday was like one from a movie or a nightmare. a woman taken hostage in the middle of a day by a criminal, claiming to be armed. in situations like this, hostage negotiators are charged with making split second decisions that could mean life or death. abc's senior justice correspondent pierre thomas takes us inside the high stakes drama, which includes some disturbing immechanicals. >> denver, colorado. a tense standoff unfolds. a suspect who claims he's armed

takes hostages in this convenience store. the suspect decides to use this woman as a human shield. he wants to escape. >> the officers said they had to let the hostage go. he refused. >> with each step, the situation is becoming more dangerous. >> he attempted to drag the female back in the store. >> reporter: police aren't going to let him get away. the suspect is critically wounded, shot in the shoulder. the hostage is shaken but is not injured. dangerous hostage situations playing out across the country. police haven't to make split second decisions with life and death literally hanging in the balance. >> watch this frightening standoff at the walmart in midwest city, oklahoma, caught on tape last summer. the suspect takes a baby from its mother's cart while her back is turned he puts a knife to the 2-year-old child's throat. >> there's a black guy that has a kid, he took this woman's kid.

>> police try to calm the suspect down. the man starts counting down from 60. the decision is made to shoot. sometimes the police have more time to make the life and death call. last year, alabama school bus driver charles poland is killed and a little boy who has autism is snatched by an angry, deranged man, jimmy lee dikes. >> what's going on? >> reporter: to make matters worse, the boy is being held in an underground bunker, complete with booby traps. as police arrive at the scene, they discover he's planted a bomb in this pipe he planned to talk to police through. >> they were on top of the pipe. he could detonate the bomb at anytime. >> reporter: fbi behavioral scientist is flown down to alabama to help in the unfolding crisis. >> he was angry, but intelligent and controlled.

he coldly made a promise to mr. poland. you will do this or i will kill you. and he killed him. >> jimmy lee dikes is known as mean man because of his anti-government rants. a decorated navy veteran, he was due in court to face charges of shooting at a neighbor. the hostage team, which includes top negotiators quickly tries to soothe dikes in direct tyke talks on the phone. >> we wanted to try to come in and calm the situation down, calm down his emotions and try to stabilize what is a really volatile situation. >> reporter: and they knew he was watching tv in that bunker. so they carefully tailored the message when addressing the cameras. >> i want to thank him for taking care of our child. >> back in the bunker, dikes grows more dlij rabelligerent b day. >> by the end of the day, there's going to be a determination just exactly what the hell is going to take place. >> reporter: soon he's suicidal.

by day six, the danger to ethan is increasing by every second. >> he was handling the weapons and the bomb inside the bunker on a more frequent basis. >> reporter: the decision is made, they have to try to take ethan out by force. then comes the moment of truth. >> i was scared. knowing what was waiting for them down there, they went anyway. chilling. >> reporter: as the team reaches the bunker with a stun grenade, that detonates the bomb. smoke begins pouring out of the bunker. the tactical team descends into darkness. dikes begins shooting. silence. dikes is shot and killed in the confrontation. the agents were okay. remarkably sustained no major injuries. >> deadly force has deadly consequences. actually taking a human life is a big deal. it's not easily done. and they have to be prepared for

that. >> chris voss is a former fbi hostage negotiator. we asked him to dissect this week's denver standoff. if in his opinion police did the right thing. >> based on what they know at the time, if reasonably he has a gun, they have reasonable grounds to believe she's in fear for her life. she's in imminent danger. she's moving in a direction where he might possibly escape with the hostage. which is the worst of all possible scenarios. >> reporter: voss said matters can get even more dicey when the hostage starts to struggle as she is pushed. >> the threat level is increasing even more and increases the likelihood that he could either intentionally or accidentally kill her. >> as he makes his move back into the store, the pressure builds. >> this is getting more dangerous by the moment. especially with his refusal to go back inside. >> reporter: police take the shot. >> police have yet to reveal whether the suspect actually had a gun or not. but for voss the decision is clear. >> that was completely

appropriate. they had no choice. i don't see any other options here at all. >> reporter: no choice, trigger pulled and another standoff is over. it will not be the last. for "nightline" i'm pierre thomas in washington. >> our thanks to pierre thomas for that. then from up in the air to deep in the earth. we're joining emerald hunters hoping to find a precious prize. ♪ we're gonna be late. ♪ ♪ ♪ oh are we early? [ male announcer ] commute your way with the bold, all-new nissan rogue. ♪

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they call it green fire,

emeralds buried deep in the earth that glitter in the light. they're some of the priciest precious stones on the planet. and tonight, an expert gem hunter takes us to the hidden mines of colombia where few dare to go. and just a single stone could transform a meiner's life forever. if they can get it. here's our series "off the map." >> deep underground in the mountains of colombia, we're on hunt for one of the world's most precious stones. >> we're about one football field below. >> reporter: a green rock so dazzling, so valuable these miners are willing to risk everything for a chance to find just one. >> hear that? that's the jackhammer. they lead me down a dark, wet maze of tunnels, through steal ga

steel gates meant to keep intruders out. >> do you hear that dynamite? let's get out of here. >> they're going to blast over there. let's go, let's go. >>. >> reporter: it's a wild frontier ruled by paramilitaries, thieves, and occasionally angry mobs. >> everybody is furious. >> reporter: but for those hardy enough to tough it out, here's the prize. this one is from there? whoa, these are huge. beautiful emeralds that could make them rich beyond their wildest dreams. >> wow. our journey begins with the breathtaking life over colombia's fresh fields of coffee and sugar cane. but the beauty is deceiving. many of those winding roads are ruled by gorilla figuerrilla fi. >> it will be too dangerous. we're flying over these beautiful, beautiful lands. it's a green fire obsession.

>> reporter: he spent a lifetime chasing that obsession. an he's within of colombia's top gem hunters. >> it's an incredible feeling. it's very rare. >> reporter: for 40 year, he's tracked down the wofrld's most expensive emeralds. >> why is there so much security here? double locks on all the doors? >> it's worth a lot of money. >> reporter: they'll play top dollar for private collectors and big museums. he's so well known in bogota's emerald districts, sellers swarm us, hoping to catch his eye. >> $500 for all of them. >> reporter: is that a good deal? >> no, not at all. >> reporter: it takes a special stone and that's why he's agreed to take us directly to the source. the muzo mines, home to the richest emerald deposits in the world. >> that's river is called the miner's river. tooth right is the town. and to the left are the mines. all these are mines.

>> reporter: turf wars here left thousands dead. and while the violence is nothing like it was, the threat of kidnapping, even murder is still very real. on the ground, we're greeted by the mine's manager. he tells us we only have a few hours to explore. he can't guarantee our safety once the local gangs and militias find out we're here. >> we're going to a mine that's a very isolated road. >> reporter: this is a land of desperation for so many people? >> yes, complete survival. and let me tell you, people here will do anything to get themselves one way into the tunnels. and they will work for no salary. to be a miner, it's hard, hard. i mean, just to work in a mine is -- it's horrendous. >> reporter: and they're the lucky ones. because some only get this far, digging through the leftovers. so they're not employed by the company, but they're allowed to

do this? >> whatever they find is theirs. they don't share it with the company. >> reporter: then we find a more desperate scene. women and even children sifting through scraps in the river. the mining company gives them these bags as a good will gesture. but it only stirs more resentment. have all these people been waiting until 2:00 in the morning. nada? >> you can see, all of these people are just running down the hill. they're only allowed to have one of these bags filled with the dirt that came out of the pit. their dream is to go down, wash it out of the water with the river and find some emeralds inside. they're still poring through. have you ever found an emerald in your life? >> no, just leftover. >> still proof that the best emeralds are deep underground. >> the company isn't happy we're

here. they don't want us to talk to these people anymore. they want us to get out and so we're going to get out of here. as we suit up to g into the mines, they give us after safety briefing that's unsettling. >> reporter: if there's an explosion, there's no danger the tunnel will collapse around us? >> reporter: okay, guys, let's go. pretty tight. this is the oxygen so we can breathe. so we have oar going to now go downward on this elevator. when we get down to the bottom, we're going to then cut to a horizontal tunnel and continue on that. it will be interesting. >> the noise is deafening. but nothing compared to what i'm about to experience.

the jackhammers stop and behind the rock, you heard that dynamite. we meet a 67-year-old miner who's been working these tunnels for 40 years. how many emeralds do you think you found? few, but he's been able to survive. would you tell your friends or children to have this job? >> no, never. >> reporter: is this the last place they found emeralds the middle of last year? a year snoog -- ago? they told me they haven't found emeralds since mid last year. you're kidding me?

those guys back there told us one of their colleagues finally just gave it up. he can't take it anymore. even when they do find emeralds, sometimes the company never finds out. >> how do they smuggle it out of here? >> they put it in their pocket. sometimes they swallow them. >> when you find some, do you put it in your pocket and walk away with it? the guy in the blue helmet isn't laughing. because he' sent here by the mining company to keep an eye on everyone to make sure we're not stealing anything. whoa, these are huge. wow. >> reporter: but above ground, proof that even the best security measures don't always work. >> all of these guys have been mining for them? >> yeah, everybody. everybody here. >> reporter: how much do you think all of this is worth? >> maybe around $5,000. >> reporter: do you think that's about right? >> no. >> reporter: he's just hoping we're suckers and pay $5,000 for this.

but now our time is almost up. we need to get back to that helicopter before anyone gives us trouble. >> let's go. >> reporter: most beautiful valley i've been to for a long time. >> so we must leave this place empty happeneded. but as we fly over the desperate prospectors still sifting in the river below, we get this reminder from the veteran of these hills. >> they feel the emerald is going to satisfy all their needs. they'll hit the pocket and wow. >> reporter: for "nightline," i'm bob woodruff. >> thanks for that nas nating report. coming up next, a police investigation about justin bieber. what did they find? my antidepressant worked hard to help with my depression. but sometimes, i still struggled to get going, even get through the day.

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tonight's "feed frenzy." batd bnews for justin bieber. it all started with an egg. or a few dozen. neighbors claim justin bieber caused extensive and expensive damage, $20,000 worth. >> it's a crime. i mean, i get that it was done with eggs, which makes you feel that it's a lore level crime, but a felony crime is a felony crime, no matter how you commit it. >> bieber isn't in the clear yet. >> he hasn't been arrested nor exxon traited. >> but officials searching his california mansion today did arrest one of his guests after saying they found drugs on the premities. it's not the singer's first fight with the neighbors in his wealthy gated community. >> i met most of you from

previous run-ins that occurred at the residence with him or someone else. >> they're accused him of driving around recklessly, just like in his music video. ♪ >> and throwing wild parties. is it just a phase for the 19-year-old? friends feel the scrutiny isn't quite fair. >> unfortunately the reality is he has to live with the cameras in front of him. and what he chooses to do on and off camera is analyzed. >> bieber is also having some trouble at the box office. his new film "believe" only earned $2 million on opening weekend. compare that to his first film, "never say never" which earned nearly 15 times more. tough times in bieber's world. we'll stay on the story. thanks for watching abc news. tune into good morning america tomorrow. and as always, we're online at abc news.com. good night, america.

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