Brought to my attention by Monkey In The Middle:
An instructor at a terrorist training camp about 60 miles north of Baghdad, while trying to demonstrate how to make car bombs, accidentally set off his explosives, killing 21 of his pupils. Other terrorists at the site, including some who were wounded, were later arrested.
Read the story at The Times Of Israel.
This is not the first time I've heard about bomb-making terrorists blowing themselves up. Another such incident took place in 1970, in a city that is a lot closer than Baghdad.