Obama: US still not sure who used chem weapons

PRESIDENT BARACK Obama answers questions during his news conference in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 30, 2013 in Washington. The president said he's asked the Pentagon for range of options if President Assad has used chemical weapons in Syria.

WASHINGTON (AP) — President Barack Obama strongly suggested Tuesday he’d consider military action against Syria if it can be confirmed that President Bashar Assad’s government used chemical weapons in the two-year-old civil war.

At a White House news conference, the president also defended the FBI’s work in monitoring the activities in recent years of one of the men accused in the deadly bombing at the Boston Marathon two weeks ago.