At least ten people were killed and 20 others injured in a bomb blast on Friday morning in Khyber agency of northwest Pakistan, reported local media.

According to the media reports, the blast took place at about 11:00 a.m. local time when a bomb went off at a market temporarily set up for Friday trading in the city of Tirah Valley in Khyber Agency.

Police and rescue team have arrived at the scene shortly after the blast was reported.

The seriously injured people in the blast are being shifted to hospital in Peshawar, a nearby city.

No group has claimed the responsibility for the blast yet.

The blast is the second of its kind on Friday. Earlier this morning, a police vehicle was reportedly attacked by a remote- controlled bomb in Pakistan's northwest tribal area of Orakzai, injuring at least three cops in the vehicle.

Friday has been considered as a sensitive day in Pakistan as many terrorist attacks are launched on this day. The May 28th and July 9th terrorist attacks in Pakistan both happened on Friday. The former which took place at two mosques in Pakistan's eastern city of Lahore left over 90 people killed and over 100 others injured. The latter which occurred in Pakistan's northwest Mohmand Agency killed 107 people and injured more than 120 others.