The area's top law enforcers have signed what was described as a historic agreement with the El Salvador police.
Los Angeles Police Chief William Bratton and Los Angeles County Sheriff Lee Baca have agreed to send two officers or deputies to El Salvador to study how police deal with the problem of street gangs.
In turn, El Salvador will send four officers to patrol the streets of Los Angeles and observe how officials here tackle gangs.
The officer exchange program was inaugurated Monday at a summit of police chiefs from across the globe. They are meeting to discuss the problem of international gang violence.
As well as Baca and Bratton, Mayor Antonio Villaraigosa and the director general of El Salvador's Civil National Police attended a signing ceremony for the new program.