The bloodied bodies of two men, purportedly Americans killed during fighting in Fallujah (search), were shown on Arab TV Sunday.

It was not clear when the two were killed. In the footage, aired on Al-Jazeera (search), gunmen seen moving around the bodies are heard saying that the two are American intelligence agents. They pointed to a burning car nearby they said belonged to the two men.

One of the bodies lay sprawled on the pavement, his face bloody and his right leg drenched in blood. The other had been rolled onto his stomach, his shirt pulled up to show a bullet wound in his back.

Both appeared to be Westerners and wore dark t-shirts and khaki pants commonly worn by private security contractors.

Marines have been fighting this week against Sunni (search) insurgents in Fallujah, but both sides were largely observing a cease-fire on Sunday.