It has happened here, only the guy used a knife instead of a gun. They are here in large numbers, but are keeping a low profile for now. When in public, when I see someone dressed in muslim garb, I put as much distance between us as possible and I never turn my back on someone dressed in muslim clothing.
Mohammedans’ susceptibility to “Sudden Jihad Syndrome” is one of many reasons I carry a pistol everywhere I am able to do so.
Probably a wise precaution on your part if you are in daily contact with people of peace at least as seen by Obama.
When I see someone dressed that way, I understand the pure revulsion Jews felt in Nazi Germany in the 1930’s when they saw uniformed Nazi Storm Troopers, because I feel exactly the same way now.