If I was a crazy enough Russian nationalist (not stupid, but crazy) and wanted to carry out such an act to justify my planned atrocities against the muslims I would hire a stupid caucassian, brainwash him and make him blow himself out in the middle of the crowd. Then I would stand up and say 'Look, they attacked us, let's kill'em all!'
Гмммм... а как будет по-русски "Troofer"?