Istanbul: A Turkish court on Sunday ordered a man to be held in custody over an attack on the US consulate in Istanbul in which six people were killed, the state-run Anatolian news agency reported.

The court ordered that the man, identified only as Dursun P., be held on suspicion of belonging to a terrorist group while prosecutors continued questioning nine other people and prepared an indictment.

Two people were released but might still face prosecution, Anatolian said.

The suspects were being questioned about Wednesday's attack in which three police officers and three attackers were killed when gunmen opened fire on security personnel at the entrance to the high-security consulate complex.

A man suspected to have driven the car used by the attackers was detained on Thursday.

Police were investigating possible Al Qaida involvement and newspapers reported that the gunmen received weapons training in Afghanistan.