Obama tells U.S. that San Bernardino shootings part of 'new phase' of terrorism

WASHINGTON (Reuters) - President Barack Obama worked to reassure Americans on Sunday that his administration is doing all it can to reduce the risk of militant attacks after a couple in California carried out what he called "a new phase" of terrorism.

"This was an act of terrorism, designed to kill innocent people," Obama said in a rare televised address from the Oval Office in the White House.

(Reporting by Jeff Mason, Roberta Rampton, Kevin Krolicki and Matt Spetalnick; Editing by Peter Cooney)