One Boston bombing suspect killed

The Boston Marathon bombing suspects — armed with explosives and guns — battled law enforcement officers in a Boston suburb early Friday morning, unleashing chaos until cops took one of the men into custody and the other fled, law enforcement sources said.
Officials later said the suspect taken into custody died and authorities identified the man on the run as the "white-hat" suspect, referencing photographs released by the FBI Thursday. Authorities warned he should be considered armed and dangerous.
The standoff in Watertown, Mass., erupted shortly after the fatal shooting of a Massachusetts Institute of Technology police officer. A transit police officer was also wounded in the Watertown fire fight, officials confirmed to NBC affiliate WHDH.