GREENWOOD, Ind. – A shooting at the Greenwood Park mall food court has left four people dead, including the gunman.

Greenwood Police Chief Jim Ison says the gunman was armed with a rifle and several magazines. He says the shooting ended within seconds, when the gunman was shot and killed by what Ison calls a 22-year-old “Good Samaritan” from Bartholomew County.

Ison says police arrived at the mall quickly, with Greenwood and Indianapolis SWAT units joined by state troopers, sheriff’s deputies, and F-B-I and A-T-F agents. But he calls the unnamed man who brought down the gunman “the real hero of the day.”

Two people were wounded by gunfire, including a 12-year-old girl who apparently suffered a graze wound. The girl was treated and released. Ison says the other victim is hospitalized in stable condition.

Other than the 12-year-old, Ison says the victims range in age from their early 20s to 30.

Ison isn’t confirming reports that an argument had broken out before the shooting. He does say police have reviewed some surveillance video.