The victim was killed near his home in Daly City last summer because he was believed to be a member of another gang that has long been at odds with MS-13, prosecutors said Wednesday.
"Three suspected gang members are now facing justice for a senseless killing," said Shane Folden, Special Agent in Charge of Homeland Security Investigations for Immigration and Customs Enforcement.
The U.S. Attorney's office in San Francisco said the suspects were charged with murder in aid of racketeering and other offenses. They were identified as Davie Mejia-Sensente, 26, Daly City; Carlos Mejia-Quntanilla, 21, San Francisco, and Luis Amilar-Zanas, 32, San Francisco. All three were previously in jail on immigration and other charges.
Prosecutors said in a written statement the defendants were required by MS-13 to attack anyone suspected of being a member of a rival gang. The San Francisco Chronicle said police did not believe the victim, 26-year-old Alexander Castanon was a gang member although he had been involved in some sort of altercation on the bus prior to being shot.