The Pentagon said it had no information on any missing or crashed U.S. helicopter in Iraq. It said the U.S. military in Baghdad knew of no such incident but that checks were being made.

Jazeera's correspondent quoted witnesses in the town of Hit, 90 miles northwest of Baghdad, saying the helicopter crashed during clashes after armed Iraqis attacked a local police station.

The correspondent reported U.S. forces withdrew from city after coming under heavy attacks from residents angry at their presence. He said some residents said they shot down the helicopter.

The residents attacked the police station because they were angry with Iraqi police for helping American forces in house-to- house searches for weapons, the Jazeera report said.