US warplanes have attacked targets in the Iraqi town of Falluja in a second night of heavy fighting.
Gunfire flashed for nearly two hours, leaving an orange glow and clouds of black smoke in the sky.
Anti-coalition forces have holed themselves up in the town, which has been under siege for some time.
Earlier on Tuesday, US forces had dropped leaflets in the town, saying: "Surrender, you are surrounded. We are coming to arrest you."