13 May NY Times - U.S. Sweeps Iraq Seeking 3 Soldiers Missing in Attack by Kirk Semple.

About 4,000 American ground troops supported by surveillance aircraft, attack helicopters and spy satellites swept towns and farmland south of Baghdad today searching for three American soldiers who disappeared on Saturday after their patrol was ambushed, military officials said.

The Islamic State of Iraq, an insurgent umbrella group, claimed responsibility today for the attack, which killed four American soldiers and an Iraqi Army soldier, and it said it had captured the three missing Americans. The group offered no proof for its claim...