The U.S.-led coalition says its forces have killed more than 100 militants in four days of fighting in southern Afghanistan.

The coalition says militants using gunfire, rocket propelled grenades and mortars attacked a joint patrol of Afghan and coalition troops several times beginning on Monday and continuing through Thursday.

The patrols, which were moving through the southern province of Helmand, returned fire and called in fighter aircraft for support.

A coalition spokesman said Thursday that the engagements were continuing and he couldn't provide any more details.

The coalition statement said no Afghan, coalition or civilian casualties had been reported.