BAGHDAD, Iraq – The U.S. military recovered the bodies Tuesday of two missing soldiers from an area it said was rigged with explosives. An Iraqi official said the Americans were tortured and killed in a “barbaric” way.

An insurgent group claimed the new leader of al-Qaida in Iraq executed the men personally, but it offered no evidence. The U.S. military did not confirm whether the soldiers died from wounds suffered in an attack Friday or were kidnapped and later killed.

The discovery of the bodies dealt a new setback to U.S. efforts to seize the momentum against al-Qaida in Iraq after killing its leader, Abu Musab al-Zarqawi, in a June 7 airstrike. Violence was unabated Tuesday, with at least 18 people killed in attacks nationwide.

Coalition forces spotted the American soldiers’ bodies late Monday, three days after the men disappeared following an attack on their checkpoint south of the capital, the military said.

Maj. Gen. William Caldwell said the bodies were found together in the vicinity of an electrical plant, which would be just a few miles from where the initial attack took place near the town of Youssifiyah in the volatile Sunni Triangle south of Baghdad.

Caldwell said the remains were believed to be those of Pfc. Kristian Menchaca, 23, of Houston, and Pfc. Thomas L. Tucker, 25, of Madras, Ore. The bodies will be flown from Kuwait to Dover Air Force Base for identification through autopsies and DNA testing.