An 11-year-old was robbed of his cellphone Tuesday afternoon in Elmont by a 20-something assailant who knocked the boy down, police said.

The victim was talking on his cellphone at 2:55 p.m. while walking on Croydon Road when the robber "grabbed his cellphone and then pushed him to the ground" and fled, Nassau County police said in a news release.

The boy was not injured, police said.

Fourth Squad detectives are investigating.

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The suspect was described as being in his 20s, about 5 feet, 10 inches tall, "wearing a gray sweater with a black design, gray hat, and dark jeans," police said.

Anyone with information about the robbery is urged to call Nassau County Crime Stoppers anonymously at 800-244-TIPS.