The two men killed by members of the Border Crimes Prevention Unit remained unidentified Thursday but were believed to be Mexican nationals, police said Thursday.
About 5 p.m. Wednesday, two San Diego police officers and three Border Patrol agents on patrol in the area west of the San Ysidro border crossing met several men who said they had been robbed.
Police said the men pointed to another group of men on a bridge near the south levee of the Tijuana River, prompting several of the alleged bandits to shoot at the officers.
Police said two of the bandits were shot when the police officers and Border Patrol agents, who were not injured, returned their fire.
One man was killed instantly and the other died from his wounds, police said.