Turkish police on Tuesday rounded up 12 people in an operation against the Al-Qaida network, a news channel reported.
The operation was launched early in the morning in the southern provinces of Gaziantep and Sanliurfa and Konya in central Turkey, the report said.
Anatolia news agency reported that the police were also searching several locations in the three regions.
Earlier this month, seven people were arrested on charges of links to the extremist network following simultaneous operations in the western province of Eskisehir.
A Turkish newspaper reported in March that Ankara had received US intelligence that Al-Qaida militants could be plotting attacks on foreign targets in Turkey.
A Turkish cell of Al-Qaida was held responsible for truck bombs against two synagogues, the British consulate and a British bank in Istanbul in 2003, which killed 63 people, including the British consul, and left hundreds injured.
Seven men were jailed for life in 2007 over the bombings, among them a Syrian national who masterminded and financed the attacks.
In January, a suspected Al-Qaeda militant was killed and three others captured in a shootout with the police in Istanbul after the group attempted to rob a post office.
