CAIRO, Egypt — An Al Qaeda umbrella group claimed in a new video released Monday that its militants killed three U.S. soldiers after capturing them last month in Iraq.

The video, which was made available to The Associated Press by the Washington-based SITE Institute, showed confused and jerky night battle scenes, and later offered close-ups of two identification cards. It does not show the soldiers.

The military ID cards featured in the video appear to be authentic, a U.S. official said. Further analysis of the images was being conducted.

The body of one of the soldiers was later found in Iraq's Euphrates River, but the other two remain missing. Family friends of the missing men said the U.S. military briefed relatives about the video over the weekend.

SITE Institute, which monitors terrorist websites, did not say how it obtained the video. The logo of media production house of the Islamic State of Iraq appears on the video.

Along with the identification cards, the footage also showed credit cards, American and Iraqi money and other personal items that they called the militants called the "booty."

The video also showed footage, apparently taken before the ambush, of three masked men standing around a stand displaying a sketch of the area, mapping out the attack plan. One of the three men, who were all dressed in black, talked to the camera and pointed to the sketch. Another stood by him carrying a gun.

"I have urged you to bring me American prisoners. We will review now a previously prepared study in our zone to bring the enemy to a good area, and with God's help we will be able to storm their place and capture them at night," said the man, whose name was not given but was identified as one of the militant group's leaders.

A prominent Islamic Web sites that commonly posts videos from militant groups including the Islamic State of Iraq said in a banner headline that it would show the video within hours, but the video has not yet appeared.

In Washington, Pentagon spokesman Bryan Whitman said he had not seen any video but heard there were "promises made that a video may be released."

"Our search continues for the missing soldiers," Whitman said.