ISTANBUL - Turkish police detained 40 suspected members of al Qaida and the Turkish Islamist militant group Hezbollah in raids in Istanbul on Tuesday, state media said.State-run TRT channel said among the detainees was Halis Bayancuk, whom the channel identified as the head of al Qaida's branch in Turkey. State-run Anatolian news agency said operations were under way in a number of Turkish provinces.Turkish police often arrest suspected Islamist militants and describe them as having links to al Qaida, though details seldom emerge.