A suicide bomber has attacked a court in the northern Pakistani city of Mardan, killing at least 12 people and injuring more than 50, officials say.

The attacker threw a hand grenade before running into the court area and detonating a bomb, police told the BBC.

Also on Friday, four suicide bombers targeted a Christian neighbourhood near Peshawar before being shot dead.

Both attacks took place in Khyber Pakhtunkhwa province, and were claimed by Taliban faction Jamaat-ul-Ahrar.

Militants have targeted lawyers in the past, including a bomb attack in Quetta last month that killed 18 lawyers. That attack was also claimed by Jamaat-ul-Ahrar.