DETROIT -

Police are investigating after a man was beaten to death Sunday at a party store at 8 Mile and Hubbell Road around 7:20 p.m.

Police said the victim, who was reportedly assaulted by three men inside the store, is approximately 60-65 years old.

Police have the three men, ages 39, 16 and 15, in custody.

It's unclear what provoked the attack.

The victim was transported to Grace Hospital, where he was pronounced dead on arrival.

Watch Local 4 News and refresh ClickOnDetroit.com for updates on this story.