An armed man robbed partygoers gathered in a backyard in Elmont early Sunday, Nassau County police said.

Five men were in the backyard of a Cameron Street home shortly before 1 a.m. when an armed man came into the yard and demanded property from the victims, police said.

The suspect took four iPhones and a Metro PCS cellphone before running away, police said. No one was injured, and the Metro PCS phone was found later at the scene.

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The suspect was described as in his early 20s, between 5'6" and 5'8" tall, and wearing a face mask.

Police ask anyone with information about this case to call Nassau County Crime Stoppers at 800-244-TIPS. Callers will be kept anonymous.