Islamabad: At least 23 people were killed and over 70 others injured today when a powerful bomb ripped through a second-hand clothes market in a Shia-dominated area in northwest Pakistan's restive tribal region near the Afghan border, an attack claimed by a sectarian outfit.

The blast occurred in Parachinar in Kurram agency when the market was filled with a large number of people who were buying used and second-hand winter clothes.