BEIJI, Iraq (AP) - A group of American soldiers in an insurgent-riddled town allegedly noticed a young Iraqi woman when on patrol and later returned to rape her, according to U.S. officials Friday. In an apparent cover-up attempt, she and three members of her family then were killed and her body was set on fire.

Five U.S. troops are being investigated, a U.S. military official told The Associated Press.

It is the fifth pending case involving alleged slayings of Iraqi civilians by U.S. troops.

The suspects in the killing, which took place in March, were from the same platoon as two soldiers kidnapped and killed south of Baghdad this month, said the official, who is close to the investigation and spoke on condition of anonymity because of the sensitivity of the case.

One soldier was arrested after admitting his role in the alleged attack on the family, the U.S. official said. The official said the rape and killings appear to have been a