FORT WORTH (CBSDFW.COM) — Gunfire at a small convenience store in Fort Worth after a person tries to get into the store by climbing into the drive-thru window.

The incident happened just after 2:00 a.m. at the J&K Food Store, in the 3700 block of East Rosedale.

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An employee told police he felt threatened as a man forced his way into the 24 hour store through the drive-thru window. At some point the employee, who was armed, fired a shot toward the alleged invader.

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The bullet hit the yet to be identified man in the side. He was taken to a local hospital by ambulance, and at the time was in serious condition.

The store employee wasn’t injured.

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The incident is still being investigated and police say they are working to figure out why the man was trying to enter the business.