A U.S. Marine F/A-18 Hornet jet flies low in this 2013 file photo.

WASHINGTON - The U.S. military says American jet fighters and drones have conducted four more airstrikes on Islamic militants in Iraq, taking out armored carriers and a truck that were firing on civilians.

U.S. Central Command says the strikes were spread out, with three before noon Eastern Daylight Time on Saturday and one about 3 p.m.

The military says indications suggest that the strikes were successful in destroying the armored vehicles.

This is the third round of airstrikes against Islamic State forces by the U.S. military since they were authorized by President Barack Obama.