A bomb has gone off in the north western city of Mardan outside a government office, killing at least 12 people and wounding 35, Pakistani authorities said.
The assault happened outside the regional office of the National Database and Registration Authority, which issues Pakistanis identity cards, said senior police officer Saeed Khan Wazir.
Authorities are still trying to ascertain when the bomb was rigged to a motorcycle or whether the attack was completed by a suicide bomber.
The dead and wounded are being taken to hospitals, Mr Wazir said.
No one immediately claimed responsibility for the attack but preceding such attacks are blamed on the Pakistani Taliban.
Mardan is about 50 kilometres (30 miles) north west of Peshawar, the capital of Khyber Pakhtunkhwa province bordering Afghanistan.