Dallas police are investigating a shooting where a hired maintenance man shot another man after an altercation outside an Oak Cliff grocery store Monday night, officials say.

The shooting was reported at about 11:35 p.m. at the El Rio Grande Latin Market in the 2500 block of West Jefferson Boulevard.

According to police, the contracted maintenance worker told officers that several men, one of them armed with a gun, walked into the store and caused an altercation. The maintenance worker fired his gun, striking one of the men, police said.

The wounded man was later brought to Methodist Hospital in serious condition, police said.

No further information was released.

No arrests have been made as of this writing.