An explosion took place at Haji Bakhshi mosque in Qala-e Murad Bek area of Shakardara district, in north of Afghan capital, Kabul, provincial police said.
According to a police spokesman, Ferdaws Faramarz, the blast took place around 1:30 during Friday prayer.
At least four people were killed and more than 20 wounded in the explosion, the spokesman added.
There was no claim of responsibility for the attack.
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