US jets struck al-Bufarraj and Sufiya areas in Ramadi city at around 7.30am (0430 GMT) on Thursday, wounding an unknown number of civilians, independent Iraqi journalist Muhammad Hassan said.
Fierce clashes erupted following the raids in the eastern gate of Ramadi, near the US military headquarters and in the big mosque area in the city centre.
A US military base, nicknamed "the southern palace", in western Ramadi, also came under mortar attack, Hassan told Aljazeera.
Hassan described the city as almost deserted, with only fighters deployed in some areas and US helicopters and warplanes hovering overhead.
The city was deserted with only
fighters deployed in some areas
Doctors in Ramadi hospital called for blood donayopms after a number of wounded Iraqi civilians were brought in, Hassan said.
Some mosques also called on citizens through loudspeakers to donate blood for the injured.
Thursday's strikes came two days after US aircraft repeatedly struck fighter targets in the Iraqi town of Karabila, near the Syrian border, as part of an Iraqi-US operation to flush out fighters from various Iraqi towns.