At least 40 people were killed and more than 100 injured when five gunmen dressed in camouflage opened fire with automatic weapons at people at a concert in the Crocus City Hall near Moscow, in one of the worst such attacks on Russia in years. Flames leapt into the sky and plumes of black smoke rose above the venue, Reuters pictures and video showed. Russian media reported a second blast at the venue and there were reports that some of the gunmen had barricaded themselves somewhere in the building. ... It was not immediately clear who the gunmen were. ...