Hmm. Can we say Euroswine propaganda alert?
PICTURES! I LOVE PICTURES! Now we can surmise for ourselves without the Palestinian spin.
Look at the blood stains on the wall. Obviously the guys were standing when the grenade that caused the burn mark on the wall to the left went off, because they splattered the wall at waist level and above. But the most interesting blood marks are on the wall right next to the grenade. In order for that to happen the guy in the corner had to be standing there. Either the guy had a grenade tossed at his feet or he dropped it there killing everbody in the room.
Now my guess is as good as anybody elses, but if the grenade had been tossed in there after they died, the blood would not have been on the wall so high and the one guy would not be sitting right in the grenade mark, but would have been blown away from it. Looks like another "work accident" to me.