Officials: Tsarnaevs likely planned more attacks, probably acted alone

Boston officials said today the Tsarnaev brothers were prepared to launch more violent attacks before their odyssey of terror was disrupted last week — given the large quantity of explosives and ammunition they possessed — but that all evidence thus far indicates they were acting alone and were not part of a broader conspiracy…

“They had IEDS,” Davis said on CBS News’s “Face the Nation,’’ referring to improvised explosive devices. “They had homemade hand grenades that they were throwing at the officers. The scene was littered with unexploded improvised explosive devices that we had to point out to the arriving officers,” including one in the abandoned SUV the brothers had allegedly stolen.

Davis said today that federal authorities are trying to trace the origin of the firearms and explosive devices employed by the two suspects. “We hope to try to find out exactly where they obtained” the arsenal, he said.

Asked about any further threat to the public, Governor Deval Patrick, also appearing on “Face the Nation,’’ said “all of law enforcement feels it is over. … You can feel the relief here at home.”