Poison seems to work quite well especially when breaking their fast during Ramadam.
http://www.mirror.co.uk/news/world-news/isis-dozens-fighters-killed-poisoned-6027901
Extremists have been going since long before Sadaam & Gadaffi were deposed. A couple of days I posted a link where dozens of tourists were killed in Luxor by Egyptian extremists in 1997. I can't be bothered to post it again.