Nick Valencia@CNNValencia2m BOLO put out by Boston law enforcement for "dark skinned or black male" who tried to gain restricted access minutes b4 1st explosion
#fiedCNN
John King just verified this on CNN, said the guy wearing black with black backpack and when turned away from restricted area he broke eye contact and pulled his sweatshirt over his head supposedly just prior to the first explosion, I believe is when King said he was spotted. He then disappeared apparently.