Now we move next to the news tonight on the boston bombers. A question that we've all been asking and a possible answer tonight. Did the younger brother rlly change from a popular american student to... See More
Now we move next to the news tonight on the boston bombers. A question that we've all been asking and a possible answer tonight. Did the younger brother rlly change from a popular american student to a terrorist? Well, there's a new clue. A handwritten message he scrawled inside the hull of that boat, as he was hiding from police. Hereabc's chief investigative correspondent, brian ross, with this. Reporter: Officials say, as he lay bleeding before his capture -- we have movement in the boat. He is moving. reporter: -- DZHOKHAR Tsarnaev used a black ink pen to scrawl out his rants. On the side panels of the boat. Officials tell abc news he cursed america and that americans deserved to die because of wars in iraq and affingts. Officials say the messages undercut the contentions of his family and a bizarre youtube video called "free jahar," that he was innocent, just a fun-loving college student. Dzhokhar is one of the sweetest people in the world. Reporter: An official showed abc news what he said was a photo of another message in that boat -- "praise allah" -- and a the faintly written word brother, which officials say was a reference that his elder brother tamerlan, who was killed, was lucky because he would get to allah first. Reporter: Of course, the most important evidence may be those photos showing dzhokhar with his hat on backwards about to plant the bomb that would kill 8-year-old martin richard and maim the two norden brothers, paul and j.P., Each of whom lost a leg. Paul left the hospital just today with his mother asking what twisted person could do something to harm so many innocent people. Late today we learned the fbi has also been questioning a former chechen rebel leader now living in new hampshire, who admits he met with tamerlan tsarnaev several times, including one month before the bombing, but he's denied so far any involvement.
This transcript has been automatically generated and may not be 100% accurate.