It was indeed thrown out of the window by a Canadian player. I wasn't in the building when it was thrown, and I don't believe anyone was being malicious. But with the heat and everyone being tired at that point in the game it caused tempers to flare. It de-escalated quickly and everyone is ok now. Both the Americans and Canadians in the "international incident"
were on the REDFOR/Russian team but we had come to help calm things down (I was on the BLUFOR/US team)