MANCHESTER - A robber stole a cellphone from a man walking near Concord and Chestnut streets Tuesday night, police said.

The mugging happened about 9:45 p.m. A 19-year-old man was walking west on Concord Street when he was grabbed by his backpack from behind. The assailant demanded his cellphone and any other property he had.

The teen handed over his cellphone, but then the thief demanded his 4-digit code to unlock it.

The victim complied and, once the phone was unlocked, the robber rifled through the victim's backpack and wallet, which was inside it. Other people were walking toward them and the robber suddenly ran off, heading east on Concord Street with the cellphone.

He is described as a black man in his mid-20s, about 6-feet tall and weighing 175 to 185 pounds. He was wearing a black down vest over a dark-colored sweatshirt, and dark-colored pants.

Anyone with information about the incident is asked to call police at 668-8711. Anonymous tips for cash rewards may be made through Manchester Crimeline at 624-4040 or online at manchestercrimeline.org .