reena. >> anna werner, new york. thank you. >>> the fbi is calling a stabbing spree at a minnesota mall saturday night a potential act of terrorism. kenneth craig has the story. >> reporter: armed with a knife and dressed in a private security uniform, police say the attacker, inside this minnesota mall, left nine people wounded in his path. the ordeal sent shoppers at the saint cloud mall scrambling for safety. and investigators trying to determine if it was carried out by an isis connected or inspired terrorist. >> we will try to sort of peel back the onion and see what motivated the individual. >> reporter: islamic state run news agency calling the attacker a soldier of the islamic state. law enforcement forces described him as a 20-year-old minnesota man. officials say he mentioned allah during the spree and asked people if they were muslim before deciding whether to attack. authorities are crediting an off-duty police officer for saving lives, who shot and killed the man as the the attacker was coming at him. >>

(anna werner, cbs review of the incident. the airline refunded the family's flights. and while it gave them a 21-hundred-dollar credit towards future jetblue flights, martinez doubts she will cash in on that offer. anna werner, cbs news, new york ((paul joncich)) >> martinez said her son was wearing a wristband with his name on it. but the other child was carrying andy's passport./// ((christianne klein)) >>> georgetown university has a new plan to try and make up for an ugly moment from its past. catholic college sold 272 slaves in the 18-30's to help pay off the school's debts. georgetown now says it will give preference in admissions to the descendants of those former slaves - whose names are listed on this historic census list. officials at the university says while they know the apology is a good gesture--- there's plenty of work that lies ahead. ((ayodele aruleba, georgetown) "although this is a first good step on behalf of georgetown university, i am really looking forward to future initiatives and further legacies of slavery still seen today.")) there are curr

we begin in new york with anna werner. >> reporter: surveillance video relegalled-- revealed a white flash of the explosion as the blast at about 8:30 saturday night sent people running. still unanswered, who set off the bomb and why. new york city mayor bill de blasio. >> it was invention-- intentional it was a violent act it was certainly a criminal act. >> reporter: the blast injured more than two dozen people. this man was just a block away driving west on 23rd street with his wife when he felt it. >> a massive shock wave. your wol body shook. and my ear was sort of numb, my right ear specifically. so yeah, it was pretty traumatic. >> reporter: about two hours after the bombing, a pair of new york state troopers canvassing the area noticed something next to a dumpster. new york city police commissioner jim o'neill and his second day on the job says they probably saved more lives. >> they circled the block. they parked their vehicle and actually walked down the block and that is how they found it they did a great job. >> reporter: the pressure cooker they found was taken away by t

and as anna werner explains, the bomb components are not only legal they are be commonly found in hardware or sporting goods stores. >> reporter: sources tell cbs news that the pressure cooker device that exploded in manhattan contained residue of a material made up of ammonium nitrate and aluminum powder. former fbi agent manny gomez. >> it's a very crude simple device, put together with some devices whether ball bearings, nails, screws, et cetera, it turns into a detonation that could obviously hurt kill many people. >> reporter: gomez said the bombs were similar to those used in the boston marathon attack. experts say terrorists commonly use the crude bombs overseas. but a former fbi bomb specialist told cbs the use of them has ramped up substantially in the u.s. directions to make them can be found on the internet. those devices use hard to trace easily obtained explosives electrical trigger like a cell phone to set them off. >> in this case, it was an old-fashioned type of flip cell phone. that the caller simply calls. it sends an electric shock through, the wires -- it explodes the p

anna werner has learned more about rahami's past. >> reporter: rahami lived here with his family above their chicken restaurant in elizabeth, new jersey. he first came to the u.s. from afghanistan, sources say, as a baby, just a couple of months old. he attended edison high school in new jersey, where one classmate contacted by cbs news described him as nice and easy-- going. imam ali jaaber knew rahami and his family. >> no one knew him to be a problem or menace in school or society, or in the community. >> reporter: as a teenager, he and a girlfriend had a child, a daughter now in elementary school. after high school, he attended nearby middlesex county college, where he majored in criminal justice. a spokesman says he was a full- time student from fall 2010 through fall 2012 but never graduated. working at his family's chicken restaurant. in his early 20s, during his trips to afghanistan and pakistan, he married. in 2014, he made efforts to bring his wife into the u.s. new jersey congressman albio sires confirms rahami sent an email from pakistan to sires' office, wanting to know th

anna werner has more on this. >> reporter: the 18-minute-long 911 call came from a kidnapped woman held for three days, whispering to a >> reporter: she called 911 from the bedroom where her abductor slept, in this abandoned house across from a laundromat. >> reporter: the woman escaped out of the bedroom and saw officers walking near the house through a window. >> reporter: moments later, the officers broke in. >> reporter: after the rescue, police found the remains of two women inside the house. officers arrested 40-year-old shawn michael grate at the scene and charged him with two count of murder and one count of kidnapping. authorities say great later led them to a third body in a neighboring town. 43-year-old stacey stanley was identified as one of the women she had been missing since last thursday. her sister, gina stanley. >> and this guy that did this to her, it was-- and to these other women-- he's a monster. >> reporter: well, it may take weeks for one of those bodies to be identified because it was badly decomposed. scott, sean great will be in court for his arraignment tomor

scott, sean great will be in court for his arraignment tomorrow. >> pelley: aelley: anna werner,k you very much. next, an update on that sony government ordered a recall of the galaxy note 7 smartphone. samsung had voluntarily recalled the phones after batteries had caught fire. the government says customers should turn the the phones off immediately. today, friends and family gathered at jazz at lincoln center's rose theater to celebrate the life of morley safer. ? ? ? in 45 years at "60 minutes," stories with style, grace, and honesty. in 1987, he took us to a retirement home for opera singers. ? ? ? >> reporter: each person i spoke to here said they love this place, but each one wondered what all those untalented others were doing here. >> reporter: he was most proud of his investigation of the conviction of linel jeter, a texas man wrongly armed robbery. >> i considers myself a hostage in the house of injustice. >> reporter: well, the more we started to check it out, the more this story of convictions smelled to high heaven. >> reporter: eyewitnesses agreed. is that the man who he

anna werner has more on the explosives. [explosion] >> reporter: sources tell cbs news that the pressure cooker device that exploded in manhattan contained residue of a material called "tannerite," a legal explosive made up of ammonium nitrate and aluminum powder. device. put in some metal device, whether it's ball bearings, screw, nails, et cetera, it turns into a huge detonation that could hurt, kill or maim many people. >> reporter: gomez says the bombs are similar to those used in the boston marathon attacks.t experts say terrorists commonly use the crude bombs overseas, but a former f.b.i. bomb specialist told cbs the use ofse them has ramped up substantially in the u.s. directions to make them can be those devices use hard-to-trace, easily obtained explosive packed into cheap containers. all that's required is an electrical trigger, like a cell phone, to set them off.ff >> in this case it was an old- fashioned type of flip cell phone that the caller simplyl called. it sends an electric shock through the wires, and it

we asked anna werner to look into this. >> reporter: as ahmad khan rahami's case moves forward, federal agencies are working to keep up with what former f.b.i. agent manny gomez calls a tsunami of potential threats. the f.b.i. does not have the resource, both legally and in terms of manpower and funding. these people are being radicalized quicker than we could identify them. >> reporter: in rahami's case, despite his father calling him a terrorist in 2014, in his year-long stay in pakistan, and f.b.i. source says at the time it found nothing in its indicators, such as links to other known terrorists or radicalized behavior to, point since 9/11, the homeland security committee says there have been at least 166 home-grown jihadist plots in the u.s., including attempts to join terrorist groups overseas and execute attacks at home, an average of 11 per year. just this year alone, 26 people in the u.s. have been arrested in 13 states for isis-related activities including plots to attack, financial support and weapons charges. make a case, authorities need evidence that they often do in the f

the agency recently warned of possible risks of exposure to some ingredients in the ink.ie anna werner looked into this. online, articles and photos from people showing tattoos with infections or allergicl reactions. >> my foot just kept getting bigger and bigger and bigger. >> reporter: sara lindhorst of illinois, the sister of a cbs news employee, says this tattoo quickly became infected and sens her to the emergency room. >> they told me it was a pretty bad infection and put me on m antibiotics. >> reporter: tattoo shops should use gloves and sterilize instruments, but there are other risks.ru contaminated tattoo inks from manufacturers ha for some infections and f.d.a. reports seven voluntary recalls of adulterated ink since 2004. but what makes up the i think is also a concern. the f.d.a. has not approved any tattoo pigments for injection into the skin, and they say many are colors used for printers' ink or automobile paint. >> we really don't know what'sri in these inks. >> reporter: arisa ortiz is a dermatologist with u.c. san ta and minerals, but they're usually just industrial

>> dickerson: anna werner in new york. thanks, anna. we go now to new york congressman peter king, who sits on both the house intelligence and homeland security committees. congressman, governor cuomo just international terrorism. do you think that's the case? >> we don't know. in fact, in many of these cases we don't know until two, three or four days later whether or not there is a terrorist link. whether or not it's connected overseas. whether or not it's homegrown. the fact there is no evidence right now doesn't mean much. we have the times square bombing back in new york in 2011 i guess it was, and there was no... it took several days before we realized that was coming out of the taliban and pakistan. the boston marathon we didn't know for several days if that was terrorism. so i think we have to assume that terrorism is always a real possibility and go from there. whether it turns out to be or not, we don't know, but i certainly would in the think of ruling out terrorism at this stage. >> dickerson: what's the best way to react fo