Three suspects have been detained in connection with the hold-up, police said.
The robbery happened shortly after 9 a.m., as several people were waiting for rides, police said.
"The suspects parked nearby and robbed their victims of bags and electronics at gunpoint," police said in a crime advisory. "Based on descriptions obtained during our preliminary investigation, officers safely located and detained a possible suspect vehicle and occupants."
Three suspects remained in custody late this afternoon as the investigation continues.
Anyone with information about the crime is urged to contact investigators at (510) 238-3326 (Robbery) or Crime Stoppers of Oakland (510) 777-8572) or submit an anonymous tip.
The advisory said Nixle Tip Watch allows tipsters to send Oakland police a tip in three ways:
1. Text your tip beginning with “TIP OAKLANDPD” to 888777 from your cell phone
2. Call our toll-free tip hotline at 855-TIPS-247 (855-847-7247)
3. Submit tips through the Nixle web link
The robbery is the latest in a number of street robberies and other crimes in Rockridge that have aroused community fears.
"We are committed to increasing public safety: addressing violent crimes and street robberies is a priority," police said.
For other police-related news on Berkeley Patch, see our "Police and Fire" section.