Published: Jul 02, 2013 2:01 PM EDT

LEE COUNTY, Fla.- The Lee County Sheriff's Office is investigating an armed robbery that happened just after midnight at a Circle K, located at 11225 S. Cleveland Ave.

The victim told investigators she was leaving through the front door, when a masked man, dressed in black, and wearing latex gloves entered the business. She said he raised a black, semi-automatic handgun to her and uttered something she couldn't make out. That's when she ran to the back office and locked herself inside.

Surveillance video shows the suspect grabbing the Florida Lottery Ticket rack from the counter and leaving.

A witness saw the man leaving the business, and said he fled east, toward the back of the building.

If you have any information about this crime, call 1-800-780-TIPS.