Dr Omar Ashour's latest article on the insurgency in Sinai includes the MFO and this "Oh sh*t" incident:
Earlier this month, two artillery shells landed in the gym of the MFO’s North Camp near El-Gora village at around 3am. Another mortar shell landed a few days later, destroyed a vehicle and injured a soldier. The US was able to work out the coordinates of the source of the shelling and it turned out to be the positions of the regular army. Apparently, it was "friendly fire" or a mistake.
Link:http://www.aljazeera.com/indepth/opi...074317507.html