Just logged on and learned of this. That link talks of two gunmen.
Eyewitnesses on local channel 9 being interviewed now, still saying two different people threw tear gas canisters, one from the front of the theater and one from the rear
"We have no evidence of a second gunman but obviously we are concerned about that."Police found the gunman out the back of the cinemas in possession of a gas mask and a rifle and a hand gun.
"There was another weapon in the theatre."
Perhaps this is why there is some confusion about the number of shooters.