KHAR, Pakistan, May 28 (Reuters) - Six pro-Taliban militants were killed on Wednesday when their vehicle packed with explosives blew up in a northwestern Pakistani region on the Afghan border, a militant and officials said.
The explosion was caused by a hand grenade that went off accidently when their comrades were travelling through the Bajaur region, where Taliban and al Qaeda-linked militants operate, a militant said.
"The hand grenade blast blew up the ammunition and explosives in the vehicle killing six militants and wounding two," said a Taliban member who declined to be identified.
Some residents in the area thought the blast was caused by a missile, perhaps fired by a U.S. drone. A drone had been flying over the area earlier on Wednesday, residents said.
There have been several such missile attacks in Bajaur in recent years, most recently this month when 14 people, including some militants, were killed when two missiles struck a house.
But district officials also said the blast on Wednesday had been caused by an accidental detonation of ammunition. (Reporting by Sahibzada Bahauddin; Writing by Augustine Anthony; Editing by Sanjeev Miglani)