TODAY

TODAY   |  May 03, 2013

Bombing suspects’ original plan was July 4th attack

Boston Marathon bombing suspect Dzhokhar Tsarnaev has told officials he and his brother, Tamerlan, had originally planned to set off their explosives in Boston on the Fourth of July, but changed their plans when they finished the bombs sooner than expected. NBC’s Pete Williams reports.

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>>> new details about the boston bombing suspects' plans to launch an attack on the fourth of july. pete williams is washington and has more on that. pete good morning to you.

>> good morning. officials say this is the version given to them by dzhokhar tsarnaev during the weekend he was questioned by federal interrogators after his arrest. he told them the boston marathon was not the original target. officials say dzhokhar tsarnaev claims he and his brother initially discussed setting off their explosives somewhere in the boston area during fourth of july celebrations but he told them when the brothers were able to finish assembling their bombs earlier than expected they decided to target the boston marathon on a day when massachusetts observes patriots day commemorating the start of the american revolution . as for where the bombs were made it was at the cambridge apartment of his brother tamerlan who lived there with his young wife and daughter. authorities said earlier investigators found explosive residue there. officials say the analysis of dna found on a piece of one of the pressure cookers used to make the bombs does not match dna taken from tamerlan's widow katherine's russell. they have many questions for her.

>> failure to find a match means we're at square one, it comes back to good detective work trying to figure out what female may have had something to do with the case.

>> reporter: investigators said the dna could have come from an employee at the place where the pressure cookers were sold. three weeks and investigators have yet to find any links to overseas groups or individuals.

>> pete williams in washington thank