ORLANDO, Fla. — Authorities in central Florida are searching for at least two people who killed a 78-year-old man during a carjacking outside a CVS drug store.

The suspects shot Uken Lloyd Cummings after they stole his car keys on Sunday afternoon near Orlando, Orange County Sheriff John Mina said during a news conference on Tuesday. They backed over him two times with his car before fleeing the scene.

Police are searching for two people who killed a 78-year-old man

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"We’re not really sure what’s going on inside someone’s head when they need to shoot anyone, for that matter, but a 78-year-old man," Mina said.

Investigators found Cummings’ stolen vehicle, and they have increased the reward for information leading to an arrest to $10,000, the sheriff said.

His daughter told news outlets that her father was picking up a prescription when the incident happened.

Cummings, was a retired hospital security guard from New York City and his wife had recently died.