The death toll in Friday's twin blasts in one of the busiest neighbourhoods in Kurram Agency's Parachinar rose to 57 on Saturday.
The first blast took place at Turi Market while the second explosion occurred when rescuers and bystanders rushed to help the survivors of the first blast, reports the Express Tribune.
Kurram is the only Shia Muslim region in a predominantly Sunni country. Sunni hardliners, currently operating through different Taliban factions including the Islamic State group, consider them heretics and have often targeted them.
In a deadly bombing in March this year, a blast outside an imambargah located in a busy Parachinar market claimed the lives of 24 people and left 90 others injured.