MADISON, Wis. -

An 18-year-old Madison woman is accused of robbing and threatening an 18-year-old University of Wisconsin student, according to a news release from Madison police.

The victim told police she was walking early Sunday morning on North Park Street at West Dayton Street when a woman came up from behind and snatched her cellphone from her back pocket. The phone also contained her credit card and identification.

Police said the victim and her friends demanded the phone back, but the robber said she had guns and threatened to kill them.

University of Wisconsin-Madison police officers intercepted the suspect as she headed toward East Campus Mall and held her until Madison police arrived.

Melanie A. Mabirizi, 18, was arrested on suspicion of robbery with threat of force, disorderly conduct and underage drinking.