Baghdad ? Two U.S. helicopters collided while landing at a base in Baghdad on Saturday, killing one Iraqi soldier and wounding four people, including two Americans, the military said. It was the second helicopter crash in two weeks.

The U.S. military said hostile fire did not appear to be the cause.

Also Saturday, the military said it killed an al-Qaida in Iraq leader suspected of masterminding one of the deadliest attacks in Baghdad, several other recent bombings and the 2006 videotaped killing of a Russian official.