A 91-year-old man has shot and wounded another man during an apparent robbery attempt outside a Detroit-area store.

Eastpointe police say the intended victim was leaving his vehicle Monday morning when he was approached by another man who was behaving in an erratic manner.

The 91-year-old told the second man that he had a concealed pistol license.

Sgt. Martin Campbell tells The Detroit News that the elderly man warned the second man "three or four times and even had the gun pointed at him ... but the suspect kept coming and pointed an unknown object at the victim."

The second man was shot in the neck. He has been hospitalized and is in police custody.

Campbell says the shooting is being investigated as self-defense during an attempted armed robbery.