WASHINGTON (AP) - President Barack Obama is convening senior national security advisers at the White House to discuss plans for possible military action against Syria. The meeting should be followed by public release of a report on intelligence the U.S. has gathered about last week's deadly chemical weapons attack in Syria. Obama says the regime of Syrian President Bashar Assad (bah-SHAR' AH'-sahd) perpetrated the attack. But he has yet to present definitive evidence to back up the assertion. Secretary of State John Kerry will speak about the intelligence report and the broader situation in Syria from the State Department Friday afternoon. Obama may also speak about Syria during the public portion of a White House meeting with Baltic leaders.