al jazeera's john terret takes a look back at that tragic day. >> reporter: no one watching or near the finish line of the boston marathon in 2013 understood what had just happened. a gas explosion? an electrical fault? a second explosion 12 seconds after the first and everyone new. boston's iconic sporting event was under attack. the youngest victim, eight-year-old martin richard had been cheering on runners just inches from the bomb. crystal and lind saiz also died lindsay also died that day. more than 360 people were injured. among them heather abbott, catapulted into a restaurant, who injured her leg so badly it had to be amputated. >> i was afraid to look at my leg, people were trampling running by me. >> following day authorities revealed both bombs were made inside commercially bought pressure cookers. each had been packed with metal shards for maximum harm. and the fbi released surveillance video showing two suspects with backpacks near the scene of each blast. they were identified as tamerlan and dzhokhar tsarnaev. that evening sean collier was shot and killed, allegedly after

john terret has the story. >> reporter: this morning the two black boxes are now in jakarta being analyzedthe flight date recorder took only 15 minutes to download. crews will focus on the voice recorder. >> inspect the condition of the unit if it is all okay then they start let's say with downloading process. >> reporter: investigators hope this will help them put together what led to the aircraft crashing into the sea with 162 on board. they believe hor bodies will be found in the plain's fuselage. >> i also told the families of crash victims that if the system is stopped it doesn't mean the search operation is stopped in total. we will continue with the search operation. >> for the family members the wait is agonizing. >> this is no wait to find them. doesn't matter what condition they're in. as long as they are found that's what i want. >> in surabaya candles were lit to remember students. adrian fernando's grand plotting is hoping for any news. >> we will not give up. even though it's been nearly a month we're not giving up hope that they will be recovered. >> reporter: john terret, a

john terret is here with us. john. >> that's right tony. the defense attorneys asked to have the trial delayed and moved. both denied by the judge. doesn't mean we'll be getting a trialfully time soon because just choosing a jury is expected to take several weeks. dzhokhartsarnaev security video shows him leaving a back tack close to martin richard the youngest person to die in 2013. but to his defenders dzhokhartsarnaev is the intim dated younger brother of tamerlan tsarnaev. wants the trial to start and be over. but can the youngest tsarnaev brother get a fair trial? in a city where he's accused of injuring 260 people and killing three? like the 1999 trial ever oklahoma city defendant timothy mcvey, was not held in oklahoma city but denver. >>> picking a pool of 3,000 people may seem onerous but not impossible. not everyone watches 24 hour cable news. >> there are a lot of people who don't watch the news who know there's a bombing incident in boston but know nothing about them. the question is whether they can put the information aside an

john terret is here. john. >> tony, good afternoon the defense council had asked to delay the start and move the trial away from boston, both denied by the judge. but that doesn't mean we'll get a verdict any time soon. because just choosing the jury alone in this trial is expected to take several weeks. to his accuseers dzhokhartsarnaev confessed to the bombing in a note he left night the boat. the youngest victim to die on april the 15th, 2013 but to his defenders dzhokhartsarnaev is the victim of an overbearing older brother now dead who intimidated him into taking part in the attack. almost two years on and boston is a city that wants the trial to start and be over. but can the youngest tsarnaev brother get a fair trial in a city where he's accused of injuring more than 260 people and killing three? his defense team lobbied to move it outside the city, not like timothy mcvey whose trialed triel was not held in oklahoma city. seem onerous but not impossible. >> frankly i don't think it is a problem to p

crammed into times square where the new year's ball will drop in less than four hours and our lucky john terretwith them. >> good evening paul from times square and hello from me and a million of new best friends. i'm going to stand aside immediately and frank our cameraman will show you a band that is entertaining the crowd here. including also florida-georgia lined very popular country band and taylor swift the country crossover artist, she's here, those who have been waiting 14 hours just to see her. frank if you can pan down to the revelers, you can see them packing in here tightly. many have been here since 8:00 this morning. the remarkable thing is they can't go anywhere, there are no bathrooms, any port apotties or anything, they have to stand and enjoy the entertainment, if they have to leave they can't get back in. the nypd is on alert to try to make this a very safe evening. we are told there have been threats against officers after the shooting of two policemen in brooklyn on the saturday before christmas. with antirhetoric posted online, after the deaths of eric garner in staten isl