(Updates with casualties, previous BAGHDAD)

RAMADI, Iraq, Oct 4 (Reuters) - A suicide truck bomber blew up outside the Iraqi army headquarters in the Sunni insurgent stronghold of Ramadi on Wednesday, wounding many but causing no deaths, police said.

Anbar province police chief Brigadier Hameed Hummad told Reuters soldiers and police at the base in western Ramadi opened fire on the truck after it smashed into a concrete wall.

"When the suicide truck bomber crashed into the wall he was killed immediately and the explosion took place afterwards," Hummad said.

He said there were "many wounded" but he had no firm casualty figures.

Ramadi is a hotbed of insurgent activity. U.S. and Iraqi forces have struggled to control the city, capital of Anbar province, where the Sunni insurgency against the Shi'ite-led national unity government of Prime Minister Nuri al-Maliki is based.

AlertNet news is provided by