WASHINGTON (AP) — Advisers say President Barack Obama would be willing to retaliate against Syrian on his own.

Britain's Parliament has voted against joining the U.S. in any military action in Syria, disappointing Prime Minister David Cameron, who says he still believes in a "tough response" to Syria's alleged use of chemical weapons on its civilians, but that he would respect the will of British lawmakers.

An intelligence report is expected to be released publicly today that supposedly contains evidence that Syrian President Bashar Assad's regime is responsible for last week's alleged chemical attack on Syrian civilians near Damascus.

U.S. officials shared the report with lawmakers they briefed last night.

One lawmaker says the officials told them that 1,300 men, women and children died in the chemical attack.