At least 32 people were killed and more than 147 wounded in a suicide bombing at a mosque in Peshawar, north-western Pakistan.

Several people were trapped after part of the building collapsed following the blast, police said.

Police say a suicide bomber targeted worshippers during afternoon prayers, while officials and witnesses said more than 260 were in the mosque at the time of the blast.

“We’re getting that the terrorist was standing in the first row,” Defence Minister Khawaja Asif told Geo TV.

No one immediately claimed responsibility for the bombing, however.

The mosque is inside a highly-fortified compound housing the headquarters of the provincial police force and a counter-terrorism department, said the city’s police chief Ijaz Khan.

Khyber Pakhtunkhwa province, which borders Afghanistan, has previously been targeted by both ISIS and the Pakistani Taliban, which is separate from but closely aligned with the Afghan Taliban. Militants last month seized a counter-terrorism centre in the city of Bannu and took hostages to negotiate with government authorities.

Several of the wounded are in a critical condition, an official at the city’s Lady Reading hospital told Reuters, with the death toll expected to rise.

Bodies are still being removed from the mosque, Peshawar city deputy commissioner Shafiullah Khan said from the mosque on Monday afternoon.

He said the priority is rescuing those still trapped under the rubble.

Prime Minister Shahbaz Sharif condemned the bombing and “stern action” against those who were behind the attack.

“My prayers & condolences go to victims families,” said former prime minister Imran Khan. “It is imperative we improve our intelligence gathering & properly equip our police forces to combat the growing threat of terrorism.”

More than 50 people were killed in a blast at a mosque in the city last March.

Violence has increased in the past year, with many attacks claimed by Tahrik-e-Taliban Pakistan (TTP).

Analysts say the group has been emboldened by the Taliban’s return to power in Afghanistan.

Border areas, where the TTP has increased activity against police and security forces, have been particularly affected.

Six policeman were killed in a TTP attack in November, days after the group ended a nationwide ceasefire with the Pakistani government.

The group claimed it was behind a suicide bombing the following month that killed one police officer in the capital Islamabad, which has largely been spared the low-level attacks conducted elsewhere in the country.