ISLAMABAD, Pakistan — A barrage of shootings and bombings shook the Pakistani city of Quetta on Thursday, leaving at least 13 people dead in three separate attacks that each reflected a different facet of the violence afflicting Baluchistan Province.

In the first, at least eight men were killed and two others wounded when gunmen opened fire on a bus, the police and rescue officials said. The victims were ethnic Hazaras, a Shiite Muslim minority group that has been repeatedly targeted by Sunni extremists in a wave of violence that has killed hundreds in recent years and left Hazaras feeling that the police cannot, or will not, protect them.

In an assault with political overtones, Maulana Fazalur Rehman, an influential religious figure who leads the fundamentalist party Jamiat Ulema-e-Islam-F, was attacked after addressing a rally at a stadium in Quetta. The police said that Mr. Rehman was leaving the venue when a suicide bomber ran up to his bulletproof vehicle. Mr. Rehman and the other passengers were unhurt, but at least three people were reported killed in the attack, responsibility for which was claimed by Jundallah, a militant group affiliated with the Pakistani Taliban.

Separately, a bomb planted on a motorcycle exploded near a security forces convoy, killing two people and wounding 12, the police said. The blast occurred as security forces were conducting a search after the attack on the Hazaras. But the authorities said that Baluch separatists, who are fighting an insurgent war against the Pakistani military, were possibly behind the attack.