The attacker was believed to be targeting a nearby police station but struck a civilian residence before reaching the intended site, said Muhammad Sajjad Khan, a local police official. The blast caused significant casualties among residents inside the house, he added.

The death toll was confirmed by Bannu assistant commissioner Ikramullah Khan, who said the injured had been shifted to nearby medical facilities.

No group has claimed responsibility for the attack. However, suspicion is likely to fall on Tehreek-e-Taliban Pakistan, which has intensified attacks in the region in recent years, frequently targeting security installations.

Bannu lies in a volatile region bordering areas that were formerly part of Pakistan’s semi-autonomous tribal belt, long affected by militancy and counterinsurgency operations.

Pakistan has repeatedly accused neighboring Afghanistan of failing to eliminate militant sanctuaries used to plan cross-border attacks, an allegation denied by the Taliban authorities in Kabul.

The newly formed Tehreek-e-Jihad militant group hours later in a statement claimed responsibility for the attack, which took place on a bridge in the Sibi district of Baluchistan province.

Small Baluchistan-based separatist groups and local militants have been blamed for previous such attacks.

Late on Monday night, the Islamic State group also claimed responsibility for the attack. It said in a statement released by the group’s Amaq news agency that IS militant Abdul Rahman al-Pakistani was driving a bomb-laden motorcycle that he ignited, killing or wounding 24 police.

Mahmood Notenzai, a local police chief, said the officers were on a routine patrol when the attack happened, initially killing nine. The casualties were taken to a nearby hospital, where one of the critically wounded policemen later died, he added. Sibi is about 150 kilometers (90 miles) east of Quetta, the provincial capital.

The force of the blast overturned the truck, which caused additional injuries, he said. Trucks often transport troops in Pakistan.

Notenzai said the officers who came under attack were deployed last week to Sibi, where an annual cultural festival was held amid tight security. An army helicopter was sent to evacuate the seriously wounded to a hospital in Quetta, where better health facilities are available.

Last year, a suicide bomber from the extremist Islamic State group targeted President Arif Alvi ’s security convoy when he attended the Sibi festival. Alvi was far away from the site of the bombing, which killed five troops. IS militants later claimed responsibility for that attack.

Prime Minister Shahbaz Sharif condemned the attack. In a statement, he expressed his condolences to the families of those killed and ordered health officials to provide the best medical care for the wounded policemen. He said the attack was part of nefarious enemy plans to destabilize Pakistan and vowed to defeat terrorism.

U.N. Secretary-General Antonio Guterres also condemned the attack and extended “heartfelt condolences” to the families of the victims and wished a prompt recovery to the injured, his spokesman said.

Abdul Qudoos Bizenjo, the top elected official in Baluchistan, also denounced the bombing.

“The terrorists who are carrying out such attacks are the enemy of Pakistan,” he said, adding that they will not shake the resolve of the country’s police.

Baluchistan has long struggled with a low-level insurgency by the Baluchistan Liberation Army and other small separatist groups demanding independence from the central government in Islamabad.

Authorities claim to have quelled the insurgency but violence has persisted. The province has also seen attacks by militants from both the Pakistani Taliban and the Islamic State group.