(NEWSER– The lesson here was not exactly intended: Islamic State of Iraq and Syria militants getting a lesson on making car bombs today accidentally set off their own bomb at a training camp in the countryside north of Baghdad, leaving at least 21 dead and resulting in two dozen arrests, Iraqi officials said. A police officer said the ISIS instructor was giving a lesson when he accidentally used a belt with live explosives; the New York Times notes that those killed were students, though it puts the number of dead at 22 and says another 15 were injured. The instructor is what the Times calls a "prolific recruiter," and an Iraq Army officer dubiously praised him for being "able to kill the bad guys for once."

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