perhaps as many as three, and police have been told to be on the look out for a black suv, black gmc uconn, and there is one eyewitness, one allegation that some of the shooters fled the scene in that vehicle. again, there is a familiar rhythm too mass shootings in the united states. there is information sorted out about how this "z" this happen and who was involved. there are eyewitness boss provide information to the media, and politician who is are briefed on the situation and offer their shots president obama has been briefed on this mass shooting in the united states. >> the president was briefe briefed--there is information that he was briefed within the last hour. we've seen this many times before. president obama has made that point, that we've seen this far too many times before. we're told that agents from the alcohol, tobacco and firearms are in the area and will be assisting as well. the president's office will no doubt issue some sort of a statement, but we've heard from him routinely on this. he has said that this has become routine. in the last few times we heard from him it