CHULA VISTA, Calif. — Three South Bay 7-Eleven convenience stores were robbed at gunpoint within the span of a couple hours Sunday morning, and police suspect that one person was responsible for all of the robberies.

The first store was targeted around 4:30 a.m. in the unincorporated Bonita area, where a man walked up to the clerk at a store on Bonita Road near Frisbie Street and flashed a gun, authorities said. The man took cash and ran off.

About a half-hour later, two more stores in nearby Chula Vista were robbed, according to police. A man matching the Bonita robbery suspect’s description pulled off a similar crime — showing a handgun and taking cash from clerks at a store on Broadway and Naples Street and then another on Third Avenue and L Street.

A Chula Vista Police Department spokesperson said that all three robberies were believed to be connected, but without a suspect in custody, it couldn’t be said for certain. A detailed description of the robber was not available.