INDIANAPOLIS -- Two would-be robbers and a pizza delivery driver exchanged gunfire early Thursday morning after the men tried to rob the worker, police said.

The incident happened at about 12:30 a.m. in the 2000 block of Bosart Avenue.

Indianapolis police said a driver for Aunt Polly's Pizza was met by two men on the front porch who demanded money and food.

One of the men fired a shot at the driver, but missed. The driver also had a gun and fired back.

Indianapolis police said they don't think either suspect was struck, but the men haven't been found.

The owner of the pizza shop said that he started having all his drivers carry guns while on deliveries about two years ago.

A sign that reads, "Warning, We Don't Dial 911" is posted inside the business.

"It's a visual deterrent. Sometimes people are armed, sometimes they're not. You just never know what you are going to run into," said owner Darrell Kreitzer. "If you want to run in here and try something stupid, you don't know what you're going to get."

The delivery driver had a valid permit to carry the handgun, police said.

Sgt. Linda Jackson said the incident is a good reminder for people to be aware of their surroundings, no matter if they're armed or not.

"If you are walking up on a porch and it's dark, and you see people sitting there in the dark, it might be a good time to turn around, go back to your car, and drive away," she said.

Police asked anyone with information to call Crime Stoppers at 317-262-TIPS.