RIVERTON — A pair of men with guns forced two women into the back office of a Wal-Mart and stole their cell phones after the store's security system prevented the robbers from getting money early Thursday morning.

Just after midnight, the men walked into the store, 13502 S. Hamilton View Road, according to the Salt Lake County Sheriff's Office. The men ripped a telephone off the wall and "terrorized" the two women, police said.

Investigators also believe a third man acted as a lookout during the robbery. He was seen driving a dark-colored pickup, police said.

Anyone with information can contact police at 801-743-5851.

— Aaron Falk