A masked gunman demanded money from a man walking out of a Franklin Square gym and threatened to shoot him Friday morning, Nassau police said.

The victim, 34, came out of the Synergy Fitness on Hempstead Turnpike about 12:20 a.m. and was approached by the suspect, who wore dark clothing and a black mask that covered his mouth and nose, police said.

The suspect displayed a black handgun, police said, but when he realized the victim had no money, he put the weapon into his waistband and walked away.

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No injuries were reported.

Detectives ask anyone with information to contact the Nassau County Crime Stoppers at 800-244-TIPS.