WASHINGTON — The United States led 55 airstrikes against Islamic State militants in Iraq and Syria since Friday, according to US Central Command.

In a statement Monday, Centcom said there were 27 airstrikes against the Islamic State militant group in Syria and 28 strikes in Iraq, hitting a wide variety of targets including Islamic State buildings, vehicles, tanks and fighting units.

One of the strikes in Syria hit the al Qaeda-affiliated Khorasan Group, it said.