myco anchor will be taking over, wolf to you now. >> reporter: thank you very much, this is a dramatic development, certainly unexpected and we do not know what caused these explosions and we do not know the complete extend of the -- extent of the injuries and at least a half dozen people appear to have been affected by these explosions and it is a 26-mile marathon which should be wrapping up mere the finish line. mike brooks our lou enforcement -- law enforcement what is going on but the scene is pretty gruesome. >> reporter: i am looking at the smoke and i was on the fbi's task force where they worked bombings all over the world and i am thinking there may have been a black powder device, it is hard to say but i am just hearing from my sources in boston that police and fire right now they are responding to a suspicious -- possibly a suspicious hotel on boilston street and need less to say, we always have two devices we are hearing about but we are always concerned as first sponsors that there are more devices and that whole area is shut down and we see a number of people and i am hea