KHYBER AGENCY - At least four militants were killed and a number of others sustained injuries, some of them seriously, when an explosive device went off in Dwathoai, a remote area of Tirah Valley in Khyber Agency, official and local sources informed on Monday.

However, identification of the deceased militants could not be ascertained. There was also no arrest.

It is worth mentioning here since long various militant groups have been fighting to get hold of the area.