PORTLAND — Three people were arrested on robbery charges after an attack in Deering Oaks.

Ryan Nadeau, 24, whose address was unknown, Kayla Warren, 28, of Portland and Jeffrey Matthews, 21, of South Portland each face a charge of robbery.

Police said a man reported going to the park shortly before 1 a.m. Saturday with a woman he described as his girlfriend. Two men ran up to them, assaulted him, threatened him with a knife and took his wallet, police said. The men left with Warren — the woman described as the girlfriend.

Police found the three suspects near the Portland Expo and arrested them. The victim’s name was not released.