PORTLAND — Three people have been arrested on robbery charges following at 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 when two men ran up to them. The men 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 by the Portland Expo and arrested them.

The victim’s name was not released.