Photos: Boston on Lockdown During Marathon Bomber Manhunt

WATERTOWN, MA - APRIL 19: SWAT teams moved into position at the intersection of Nichols Avenue and Melendy Avenue in Watertown while searching for one of the two marathon bombing suspects. (Photo by Aram Boghosian for The Boston Globe via Getty Images) Photo: Boston Globe/Getty Images

With one suspect in the Boston Marathon bombing dead and the other still on the loose, Boston and its surrounding towns are on high alert. Schools and businesses remain closed, and people are being told to stay in their homes, while heavily armed law enforcement scour the streets. See photographs from the eerie, frightening scene here.