Monterey County District Attorney Jeannine Pacioni said Monday, Nov. 9, that her office will not file charges at this time against Donald Breeden, the 18-year-old from Greenfield arrested after a Nov. 2 shooting at a beach party in Moss Landing that killed two Salinas teenagers, KTVU reported.

The victims were Nathaniel Flores, 13, and Marco Antonio Perez, 15. A third person was also shot and survived, CBS Bay Area reported. Pacioni said dozens of people, mostly juveniles and young adults, were at the gathering, including Norteño gang members, and that a dispute broke out between groups from Salinas and Greenfield. Witnesses disagreed about who shot first. Deputies collected 21 shell casings fired from two or more guns; no guns have been recovered, she said.

"At this time there is insufficient evidence to prove that Donald Breeden did not fire in self-defense," Pacioni said. The investigation remains open. Breeden had been arrested Nov. 5. Related: his earlier arrest and the Nov. 2 shooting.