Boston Police Commissioner Ed Davis said on Tuesday at a press conference that his police force is dealing with "the most complex crime scene that we've dealt with in the history of our department."
Davis said the crime scene around the finish line of the Boston Marathon, where two explosive devices went off on Monday, has been reduced from 15 blocks to 12 blocks.
"And we will continue to collapse that crime scene as the facts and circumstances make that available," Davis said, according to a rush transcript. "We want to open up as many streets and get people into their buildings as quickly as we can. We're working diligently on that. But please be patient with us in the time that we need to process the crime scene. We expect the scene will go for another two days anyway and people should make appropriate plans."