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Survivors said the assailants emerged from a vehicle and sprayed the buses and cars with bullets. Nobody has claimed responsibility for the attack and police have not identified a motive.

Thursday’s attack took place in Kurram, an area where Shiite Muslims dominate. Sectarian clashes between the group and Pakistan’s majority Sunni Muslims have in recent months.

Tribal elder Jalal Bangash said the bodies began arriving in the city Thursday evening. The Shiite community group Anjuman Hussainia Parachinar announced three days of mourning.

Coffins were draped in white cloth that bore red calligraphy. It read “Labbaik ya Hussein,� a Shiite expression in remembrance of the 7th-century martyrdom of the Prophet Muhammad’s grandson, Hussein, that gave birth to their faith.

Locals carried the coffins aloft through Parachinar as people thronged the streets. Markets, shops, roads and schools were closed. Locals and relatives of the victims staged a sit-in, demanding action against the perpetrators.

Ali Ghulam lost his nephew in the attack.

“He was a very innocent and noble man, only 40, and left behind small kids,� said Ghulam. “He was working to feed his children, he never fought with anyone. Now we are worried about his family and what we will do for them.�

Protests kicked off in parts of the city, with people chanting anti-government slogans. Some people set alight check posts and the gate at the entrance of the city. Elders have called for calm.

A senior police officer said clashes flared after the Parachinar funerals between rival tribes in Kurram, 250 kilometers (155 miles) south of Peshawar.

Sunni and Shiite tribes targeted each other’s positions in several areas of the district, the officer said. “There are some casualties, but we do not have a confirmed number for the dead and injured,� the officer added. He spoke on condition of anonymity because he was not authorized to speak to the media.

Shiite Muslims make up about 15% of the 240 million population of Sunni-majority Pakistan, which has a history of .

Although the two groups generally live together peacefully, tensions have existed for decades in some areas, especially in parts of Kurram.

Dozens of people from both sides have been killed since July, when in Kurram that later turned into general sectarian violence.