The clashes overnight between Sunni and Shiite tribes in Khyber Pakhtunkhwa Province came a day after gunmen ambushed a convoy of vehicles in the area.

Fighting between armed Sunni and Shiite groups in northwestern Pakistan killed at least 33 people and injured 25 others, a senior police officer from the region said Saturday. The overnight violence was the latest to rock Kurram,

Pakistani police say gunmen have opened fire on vehicles carrying Shiite Muslims in the country's restive northwest, killing at least 38 people and wounding 20 others.

At least 38 people, most of them Shiite Muslims, were killed in northwestern Pakistan on Thursday as gunmen ambushed convoys of vehicles that had been under the protection of security forces. The attack was one of the deadliest in months of sectarian violence in the Kurram region, a scenic mountainous district bordering Afghanistan.

At least 38 people - including women and children - have been killed after unidentified gunmen opened fire on a convoy of 200 passenger vehicles traveling through a remote area of Pakistan.

More than 30 people have died in clashes between militant Sunni and Shiite groups in northwestern Pakistan, police say. Scores have been killed in such sectarian violence in the past few months.