At least 28 people have been killed and 150 injured in a blast at a mosque in the Pakistani city of Peshawar.
A section of the building was destroyed and officials say people are buried under the rubble.
Most of those who died were part of the police force, and it is believed they were the target of the attack.
Security officials said a bomber sitting in the front row of the mosque had blown himself up. No group has admitted carrying out the bombing.
Muhammad Ijaz Khan, Peshawar capital city police officer, told local media that between 300 and 400 police officials were present in the area at the time of the blast.
Prime Minister Shehbaz Sharif has strongly condemned it. In a statement, Mr Sharif said those behind the incident “have nothing to do with Islam”.
He added: “The entire nation is standing united against the menace of terrorism.”
The blast took place during afternoon prayers in the north-western city, around 13:30 (08:30 GMT), near the country’s border with Afghanistan.
A video circulating social media and verified by the BBC shows that half of a wall has caved in. The mosque is covered in bricks and debris as people clamber over the rubble to escape.
A rescue operation is ongoing inside the mosque and “more bodies are being taken out,” Peshawar city deputy commissioner Shafiullah Khan said.
“Currently our priority is to save people buried under the debris,” Mr Khan added. (BBC)