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United states, she got exposed to a pretty significant amount of lead and that her level before that wasn't abnormal. so her exposure was in this country. it wasn't back in egypt. >> the investigators must have overlooked something, but they didn't know what. >> they went full circle. they went back to manchester. they started saying what did we miss? >> they questioned sunday's mother again and were told something they had not heard before. sunday spent a lot of time on the front porch of their apartment building. >> translator: i knew always that the cause of sunday's sickness had something ...

To a pretty significant amount of lead and that her level before that wasn't abnormal. so her exposure was in this country. it wasn't back in egypt. >> the investigators must have overlooked something, but they didn't know what. >> they went full circle. they went back to manchester. they started saying what did we miss? >> they questioned sunday's mother again and were told something they had not heard before. sunday spent a lot of time on the front porch of their apartment building. >> translator: i knew always that the cause of sunday's sickness had something to do with the apartment. >> th...

Deposits build up in the nails and hair. the average person's hair grows about a half inch per month. sunday's hair was an inch long. and provided a wealth of information. >> she had spent a month in the united states and before that she had been in egypt. so the by taking her hair and looking at it specifically for lead content, and dividing it in half so that we had the half inch that grew in the united states and the half inch that grew before that, we were able to make a comparison and time her exposure. >> the hair was bombarded with radioactive neutrons. this caused different elements in...

To collide, three people who trained in boxing and mixed martial arts. all three are now dead. and key among them is bombing suspect tamerlan tsarnaev, seen working out at allen's gym days before the attack. were you surprised by his demeanor 72 hours before those bombs at the marathon? >> unbelievable. just him entering the ring. i mean, you know, like, jumping over, both legs, feet at his shoulder height, clearing the ring, hopping in, jumping rope, like, yeah, like he was on top of the world. >> reporter: allan trained both tsarnaev and another russian speaker, ibragim todashev. >> there we...

Height. clearing the ring. hopping in. jumping rope. like, yeah. like, he was on top of the world. >> reporter: allan trained both tsarnaev and another russian speaker, e er speaker. >> they were polar opposites as individuals. tamerlan was flashy and flamboyant. ibrahim was a bit more reserved, but he was hot headed. there were a few times that ibrahim and tamerlan prayed to mecca in the gym. which wasn't abnormal for ibrahin to do it. he did it from day one. it was abnormal for tamerlan. >> they were getting closer? >> it seems so. >> reporter: allan says they trained together in 2011. that ...