Turkey ? Turkish troops killed four Kurdish guerrillas in a southeastern province Wednesday, a day after police defused a bomb in the capital that authorities believe may have been planted by separatist rebels.

The clash in the southeastern province of Siirt was the latest bout of fighting between soldiers and rebels who have bases in neighboring Iraq and have been at war with the Turkish state since 1984.

On the sixth anniversary of the Sept. 11 attacks in the United States, authorities discovered more than 1,320 pounds of explosives packed into a minibus parked near a marketplace in Ankara.

Police were looking for the driver of the minibus, the state-run Anatolia news agency reported. A witness said an unidentified man parked the minibus at a parking garage lot near a market, saying he was bringing goods to sell, the agency said.