MADISON, Wis. -- Madison police said they are investing a strong-arm robbery in which a woman was attacked while unlocking her front door.

Police said the incident occurred around 2:30 a.m. Friday in the 100 block of Langdon Street.

Police said a man ran up to the woman and grabbed her purse. The woman struggled with the robber, and he sprayed her with pepper spray, police said.

Police said the robber then fled with the purse and got into a white car and headed east on Langdon Street.