At least 42 people were killed and 72 others injured in a suicide blast that took place Saturday morning in front of a World Food Program office in Pakistan's northwest city of Khar in Bajaur Agency, reported local Urdu TV channel Geo.

According to the local media reports, the blast occurred at about 8:40 a.m. when a female suicide bomber, aged at about 23, blew herself up among the large crowds of people gathering at a checkpoint in front of the office of the World Food Program near Civil Colony in Khar, the main city in Bajaur Agency bordering Afghanistan.

An estimated 1,100 to 1,500 people were gathering in an open area in front of the World Food Program office, waiting for the food tokens to be distributed, said local media reports.

Hospital sources said that the death toll could further rise as many of the injured people are in critical condition and the facilities at the hospital are not adequate enough.

No group has claimed the responsibility for the blast yet.