It happened just after 3:00 this morning at the Circle K at the corner of

Southfield and Youree.

We're told a man walked in armed with a knife.

Authorities aren't sure how much money he made off with before running out of the store,

Investigators say the clerk was not hurt.

The suspect is a black man about five foot nine with a slender build.

He's wearing a black jacket with a red collar, a red t-shirt and black jeans.

Stay with KTBS News Now for updates on this story.