Knoxville Police are investigating after a suspect held a United States Postal Service mail carrier at gun-point, demanding he turn over his arrow key in Fountain City.

It happened on Rockcrest Road around Saturday afternoon as the mail carrier was putting packages into lockers at an apartment complex.

The suspect, a male teenager, demanded the carrier’s arrow key while showing him a semi-automatic pistol.

An arrow key allows access to multiple lockers and can make Carriers a target for would-be package thieves.

The suspect was possibly being extorted because the victim told police he said he didn’t have a choice because they have his mom.

The carrier gave the suspect a different key and he fled the scene.