Waheed Khan/European Pressphoto Agency
The worst violence was concentrated in the southwestern city of Quetta, where two explosions killed at least 57 people and wounded more than 110, the police said.
ISLAMABAD, Pakistan — Bomb blasts in two Pakistani cities killed at least 88 people on Thursday and wounded more than 270, offering harrowing evidence of how the country’s myriad internal conflicts may destabilize it as elections approach.
The worst violence was concentrated in the southwestern city of Quetta, where two explosions a few minutes apart in the evening ripped through a billiards hall in a neighborhood dominated by ethnic Hazara Shiites, killing at least 57 people and wounding more than 110, the police said.
A suicide bomber detonated his explosives inside the hall, and a second attacker then blew up his vehicle outside the club as police officers and journalists arrived, a senior police officer, Mir Zubair Mehmood, told reporters. The television channel Samaa said one of its camera operators was killed by the second explosion after rushing to the scene. Hospitals were overwhelmed as casualties arrived through the evening.
Quetta is no stranger to sectarian, nationalist and Islamist violence. Most violence against Shiites there has been directed by Lashkar-e-Jhangvi, a Sunni militant group with strong ties to the Pakistani Taliban. But there was no immediate claim of responsibility for the billiard hall attack.
An ethnic Baluch separatist group claimed responsibility for another bombing earlier on Thursday, aimed at paramilitary soldiers in a commercial part of Quetta, which killed 12 people.
The Hazara, minority Shiites who migrated from Afghanistan more than a century ago, have been the target of dozens of attacks from sectarian death squads led by Lashkar-e-Jhangvi in Quetta over the past year, but the billiard hall attack was by far the bloodiest.
Human rights activists said the police and the security forces failed to protect the vulnerable community. “The callousness and indifference of authorities offers a damning indictment of the state, its military and security agencies,” said Ali Dayan Hasan, the Pakistan director at Human Rights Watch.
The other focus of violence on Thursday was the Swat Valley, in the Hindu Kush mountains in northwestern Pakistan, where an explosion in the basement of a religious seminary killed at least 22 people and wounded an additional 60. It was not clear why the seminary, run by the Islamic missionary group Tableeghi Jamaat, was a target.
Initial reports said a gas leak had caused the explosion, but police and hospital officials later said that there was clear evidence of a bomb.
Doctors at a hospital in Saidu Sharif, near the site, said blast victims were being treated for wounds caused by ball bearings, which are sometimes packed into suicide bombs to make them more deadly.
“There was a smell of explosives,” Muhammad Iqbal, a senior doctor, said by telephone.
The violence underscores the fragility of state authority in parts of Pakistan as the country prepares for a general election that analysts say is likely to take place before June. Many Pakistanis worry that increasing instability could cause the elections to be postponed.
Islamist violence in Swat drew international condemnation in October after Taliban gunmen shot a teenage schoolgirl and education activist, Malala Yousafzai. The episode highlighted how Islamist fighters were slowly returning to the valley three years after a Pakistani military operation drove them away.
