Czech police on Tuesday launched an investigation into the panic that was sparked last weekend when anti-Islamic activists posed as terrorists in central Prague.

The activists, who were dressed in camouflage uniforms, raided the Old Town Square in Prague. They were holding toy guns, shouted "Allahu Akbar" and played sounds of gunshots over loudspeakers. The incident caused many of the tourists who were at the square to flee, fearing it was a terrorist attack.