Nassau County police are investigating an attempted robbery in Westbury early Sunday morning during which a Papa John's pizza delivery man was assaulted.

Police said the incident occurred at 12:27 a.m. after the victim, identified only as a 23-year-old male, attempted to make a delivery to an Arlington Street residence and got no answer at the door. He was approached from behind by a male who began hitting him in the head with a metal object.

The victim fell to the ground and screamed for help. The assailant, accompanied by another male, fled on foot toward Grand Boulevard without any proceeds.

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The victim with bruising on his head was taken to a hospital for treatment. He described his assailant as being between 17 and 18 years of age.

Detectives ask anyone with information regarding this incident to call Crime Stoppers at 1-800-244-TIPS. All callers will be kept confidential.