ran over him and then escaped. 900 police officers were immobilized. this is my home and it s scary to think of your homes alike a war zone almost. around 4:00 a.m., authorities released a new photo of dzhokar tsarnaev parentally taken from a convenience store camera. there s a manhunt under way. public schools and university like harvard and m.i.t. closed. trains, subways, ordered to stay put. an historic city in danger and in fear. we believe this to be a terrorist. reporter: brian todd, cnn, boston. all of this ended with dzhokar tsarnaev on a boat and this is a photo of that moment. he was on a boat on a trailer.