Several juveniles detained after attempted carjacking in San Marcos Provided and last updated 2021-04-30 01:28:25-04 SAN MARCOS (CNS) - Several juveniles were detained and one was arrested Thursday following reports of an attempted carjacking in San Marcos. San Diego County Sheriff's Department deputies responded to the area of South Pacific Street and West San Marcos Boulevard at about 2:35 p.m. on a report of the attempted carjacking and contacted a witness who said they saw a group of juveniles, possibly armed with a handgun and baseball bat, attempt to steal a pickup truck from its driver, said Sgt. Chris Hydar.