At least three people were killed and around 20 injured Friday in a bombing at a mosque in north-western Pakistan, aid workers said, DPA reported.
The attack occurred in the Pushtakhara area in Peshawar, the capital of Khyber-Pakhtunkhwa province, when people were offering weekly Friday prayers.
"Three people have been killed and up to 20 injured in the attack," said Mian Iftikhar Hussain, the province's information minister. "Steps are being taken to stop such attacks and provide complete security to the people."
A spokesman of the private Edhi rescue service, Mujahid Khan, told the German Press Agency dpa that the bomb was planted in the main courtyard of the mosque and it went off when the worshippers started coming out of the building.
Ijaz Ahmad, a senior police officer, said that 1.5 kilograms of explosive material were used for the bomb.
An witness told local Dunya TV that the bomb was hidden in bundle of old clothes and exploded at the end of the prayers.
TV footage showed cracks in the walls of the mosque and debris scattered in the inner courtyard and main prayer hall.
The injured were moved to the Hayatabad Medical Complex and Lady Reading Hospital, the two main medical facilities in the city.
Police and law enforcement personnel cordoned off the area and started a search operation in the vicinity of the mosque. But no arrests have been made so far.
Pakistan has been fighting Taliban militants in the region who in retaliation often target civilians as well as security forces.