Oddly enough, it was actually fifteen Islamic jihadists killed by the bomb they were making inside their mosque. I expect that just before the bomb went off, several members of the Vast Majority of Peaceful Muslims were rushing toward them to tell them that they shouldn't be making a bomb inside a house of worship of the Religion of Peace™.
Premature Detonation Alert: "15 insurgents killed by their own bombs in Afghan mosque," from Deutsche Presse-Agentur, June 27 (thanks to Mackie):
Kabul - Eight Arab, five Pakistani and two Afghan militants were killed when bombs they were making exploded prematurely inside a mosque in eastern Afghanistan, the Interior Ministry said Sunday.
The insurgents were assembling bombs in Desi Mosque of Yousifkhela district in the south-eastern province of Paktika on Friday, the ministry said....