Officials in Pakistan's northwest Kurram tribal region say a suicide bomber has attacked a market, killing at least 19 people and wounding at least 45.

Authorities say the blast in the town of Parachinar, near the Afghan border, happened in a busy market, around the time of Friday prayers. Officials say the explosion destroyed several shops.

Local reports say the bombing targeted Shi'ite Muslims.

There was no immediate claim of responsibility for the attack.