RAMADI, Iraq, July 24 (Xinhuanet) -- Insurgents blew up two roadside bombs in Iraq's flash point western city of Ramadi on Sunday, destroying two US Humvees and causing some casualties, witnesses said.

    "A roadside bomb detonated at 8:00 a.m. (0400 GMT) as a US patrol was passing by in the Hasiyba al-Sharqiya area in eastern Ramadi, destroying a Humvee, killing and injuring the soldiers aboard," resident Hindi Muhmoud al-Dulaimi told Xinhua.

    "Shortly after, another US patrol was hit by a roadside bomb as it was rushing to the scene for rescue work. Another Humvee was destroyed," Dulaimi said.

    It was not clear whether there was any casualty among US soldiers in the second bomb attack, he added.

    US troops cordoned off the area and searched for suspects, Dulaimi said.

    Ramadi, some 110 km west of Baghdad, has been a bastion of insurgency against US troops since the US-led invasion in 2003. Enditem