The Islamic State group claimed Thursday's car bomb attack on a police building in the Egyptian capital that wounded 29 people, including six policemen.
The powerful blast in Cairo's northern Shubra district came in the middle of the night, the latest in a wave of militant attacks targeting security forces.
"The soldiers of the Islamic State managed to target a police building by a car bomb in the heart of Cairo," said an Islamic State statement posted on a Twitter account affiliated with the group.
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The building houses a centre for investigating threats to national security.
The bombing wounded 29 people, including six policemen, said health ministry spokesman Hossam Abdel Ghaffar.
"One policemen suffered moderate injuries and the rest (of those hurt) had minor injuries," he said.
The Egyptian affiliate of IS, the Sinai Province, has regularly attacked security forces since the army ousted Islamist president Mohamed Morsi in 2013.
It says this is in retaliation for a police crackdown targeting Morsi supporters that has left hundreds dead and thousands jailed.