After California massacre, Obama to pledge powerful attack on Islamic State

U.S. President Barack Obama speaks about the shootings in San Bernardino, California during a meeting with his national security team in the Oval Office of the White House in Washington December 3, 2015. REUTERS/Kevin Lamarque

WASHINGTON (Reuters) - President Barack Obama will tell Americans on Sunday what the government is doing to keep them safe following the mass killing by a couple in California last week that is being investigated as an "act of terror," but no major shift in strategy was expected.

In a rare Oval Office address at 8 p.m. EST (0100 GMT), Obama will lay out the security steps the United States has taken since Islamic State's Nov. 13 assaults in Paris that killed 130 people, as well as since the Sept. 11, 2001, attacks on the United States, an administration official told Reuters.