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BRENTWOOD, NY (CBS/WCBS) -- Suffolk County authorities are looking for a would-be robber who was chased out of a Brentwood deli by a machete-wielding clerk.

It happened on September 25 at the Stop & Shop Deli on Crooked Hill Road. Police said a man wearing a mask walked into the deli, pulled out a gun and demanded money.

In surveillance video of the incident, the suspect is seen holding open a black bag as he fires a shot into the wall, police said.

That's when the employee, who appears to be unfazed by the robbery, pulls a large machete from under the counter and chases the suspect out of the store, police said. The suspect took off empty-handed.

Police describe the suspect as a young black man with a thin build, approximately five-feet-10-inches tall.

Crime investigators said he was wearing a gray mask, a black running-style top with white stripes on the sleeves, dark pants and black and white sneakers.

He was carrying a black Air Jordan backpack and a silver .22 caliber pistol.