WASHINGTON -- The U.S. military says it has found caches of newly made Iranian weapons in Iraq, leading senior officials to conclude Tehran is continuing to funnel armaments into Iraq despite its pledges to the contrary.

Officials in Washington and Baghdad said the purported Iranian mortars, rockets and explosives had date stamps indicating they were manufactured in the past two months. The U.S. plans to publicize the weapons caches in coming days. A pair of senior commanders said a presentation was tentatively planned for...