U.S. jets carried out another round of air strikes against Islamic State fighters in Iraq on Friday (September 26).

The F/A-18 Hornets and EA-6B Prowlers were launched from the aircraft carrier USS George H.W. Bush, and carried out missions over Iraq as part of the campaign launched by the U.S. last August against the group,

According to tribal sources and witnesses, the U.S. actions have prompted the militants to change tactics, ditching conspicuous convoys in favor of motorcycles and planting their black flags on civilian homes.

The sources report that the militants have set up fewer checkpoints, and are using their cell phones since the strikes intensified and more U.S. allies pledged to join the campaign that began in August. The sources also said the militants had split up to limit casualties.

A tribal sheikh from a village south of Kirkuk said Islamic State elements abandoned one of their positions in the area when they heard the air strike campaign was l