Police: 'No apprehension'
Timothy Alben, superintendent with Massachusetts state police, says the police have not detained their remaining suspect yet.
He says officers are going door-to-door: "We're well over 60 or 70 % of what we want to cover up there," he says. "There has been no apprehension at this point."
He says there will be a controlled explosion on Norfolk Street in Cambridge, Massachusetts, at a house "that we secured earlier today." Happening this afternoon.