Police are looking for a man they said was involved in a cellphone robbery in Queens on Sunday that was caught on video.

Police said the attacker followed an 18-year-old man into an apartment building on Crescent St. in Astoria around 6:38 p.m. Sunday.

The attacker entered the elevator, punched the victim in the head repeatedly, and stole his cellphone, authorities said.

The victim was taken to a local hospital, where he was treated for swelling and bruising.

The attacker was described as being in his 20s, was about 6 feet tall, weighing about 175 pounds, and was last seen wearing a blue jacket and blue pants.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-8477, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com