INDIANAPOLIS (AP) _ Two armed robbers stormed a gun shop and killed the store clerk, then made off with an arsenal of high-powered weapons.

From 20 to 30 weapons, including assault-style rifles, were taken Saturday night from Don's Guns. There was so much to carry the robbers had to make several trips to a waiting van, police said Monday.

There were no witnesses and the cash register wasn't touched.

``That leads us to believe that this may be some organization that is trying to get started or that has a need for these guns,'' said Robert Dine, police chief in Greenwood just south of Indianapolis. ``That's what they specifically came for. Money wasn't an object.''

The clerk, Steven Stapleton, 30, was shot five times. He was wearing a gun but there was no indication he returned fire, Dine said.

The stolen weapons include AK-47 assault rifles and AR-15 rifles, the civilian version of the M-16 assault rifle.

``They didn't take any of the cheap stuff,'' Dine said.

The shop's owner, Don Davis, offered a $10,000 reward for information in the case.

The Bureau of Alcohol, Tobacco and Firearms was helping with the investigation.