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Germany has closed its embassy in Ankara and its general consulate in Istanbul because of the threat of a possible imminent attack, the foreign ministry has said.
The ministry said the German school in Istanbul has also been shut due to an "unconfirmed warning".
The consulate said in an email seen by Die Welt that the facilities had been shut as a precaution but warned German citizens to stay away from the areas.
Foreign Minister Frank-Walter Steinmeier told reporters in Berlin that they were responding to "concrete" evidence of an attack.
He said: "Yesterday evening, our security authorities received several concrete and very serious leads that terror attacks against our German representations in Turkey were being prepared".
On Tuesday, Germany had issued an alert to its citizens in Ankara warning of an "imminent attack".
In a statement posted online, the group described the car bombing, which occurred on Sunday, as revenge for security operations in the mainly Kurdish southeast that have been under way since July, in which hundreds of civilians, security forces and militants have been killed.
The Turkish armed forces carried out air strikes against Kurdish rebel strongholds in northern Iraq hours after the attack.
The state run Anadolu news agency said nine F-16s and two F-4 jets raided 18 positions of the Kurdistan Workers' Party, or PKK, including the Qandil mountains where the group's leadership is based.
Police detained at least 11 people in connection with the attack on Monday.
Additional reporting by Reuters
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