Turkish police have uncovered and foiled an alleged plot by Al-Qaeda to bomb the United States embassy in Ankara, as well as a synagogue and other targets in Istanbul, Turkish media reported on Friday.

As a result of a February raid in Istanbul and the northeastern city of Corlu, police had arrested 12 people, including eight Turks, two Azeris and two Chechens, and seized 22 kilograms of explosives, CNNTurk reported.

Police also found documents that allegedly revealed plans by the group, which they described as a Turkish cell of Al-Qaeda, to attack a synagogue and a museum in Istanbul.

The embassy in Ankara was the target of a suicide bombing on February 1, which killed a Turkish security guard. That attack was claimed by a radical Marxist and anti-US armed group, The Revolutionary People’s Liberation Front (DHKP-C), blacklisted by the United States and the European Union as a terrorist organization.