WASHINGTON (AP) — The U.S. and five Arab countries launched airstrikes Monday night on Islamic State group targets in Syria, expanding a military campaign into a country whose three-year civil war has given the brutal militant group a safe haven.

Using a mix of manned aircraft — fighter jets and bombers — plus Tomahawk cruise missiles, the strikes were part of the expanded military campaign that President Barack Obama authorized nearly two weeks ago in order to disrupt and destroy the Islamic State militants, who have slaughtered thousands of people, beheaded Westerners and captured large swaths of Syria and northern and western Iraq.