Ajnad Misr, or Soldiers of Egypt, which has claimed previous attacks on police, said in a statement posted late yesterday on its Twitter account and on a militant website that it had used an explosive device on "officers of the criminal apparatus" as part of its campaign against security forces.
It said a group of its members carried out "a new penetration operation to reach the foreign ministry's perimeter and plant the explosive device." It did not say how they detonated the explosives.
Similar attacks have intensified since the overthrow of Islamist President Mohammed Morsi more than one year ago.
Ajnad Misr says its attacks were revenge for the violent government crackdown on Morsi supporters following his ouster that left hundreds killed.
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In July, the group claimed responsibility for bomb blasts outside the presidential palace in Cairo that killed two senior police officers and wounded 10 other people. It said the bombs it used cannot be detected by ordinary equipment.
Ajnad Misr also claimed responsibility for April's killing of police Brig. Gen. Ahmed Zaki, by detonating a bomb under his car.