At least 22 people were killed and 70 more injured on Friday in a blast which took place in Pakistan's northwestern city of Parachinar, the capital of the Kurram tribal region.
According to Reuters, the bomb blast apparently targeting a mosque on Shingak Road of the city as people gathered for Friday prayers near the women's entrance of a Shia mosque in the central bazaar.
The local political agent, Ikramullah Khan, told Reuters the death toll had reached 22, with 70 wounded.
Sajid Hussain, a parliamentarian from Parachinar, said gunfire preceded the blast, which he described as a suicide attack. The city is located in an area with a large Shia population.
"The attack took place in a busy area and a women's mosque appears to be the target," he said.
The attacked claimed by Pakistani Taliban.
This comes a month after more than 80 people were killed and dozens wounded in an attack on a crowded Sufi shrine in southern Pakistan that was claimed by Islamic State (IS).
In January, at least 21 people were killed when an explosion hit a market in Parachinar where Pakistani security forces have battled insurgent groups for years.