"We've had, in a number of the surrounding communities, a number of shootings over the last couple of months. Some have been actual homicides," said Bell Gardens Chief Randy Adams
Police found many of the weapons at the home of 27-year-old Henry Valenzuela, who claimed to work for a Mexican drug cartel.
There has been no evidence to support Valenzuela's claims.
The gang, called itself Barrio Evil 13, allegedly sold drugs and weapons to agents.
It is not known where the gang was getting the drugs or weapons, but they are being traced back to its previous owners.
"I would assume that other gang members are buying these. It wouldn't be a stretch to say that some of them may have been headed for Mexico at some point to cartel members here, or maybe even to other gang members in the Midwest or the east coast," said Steven Lovett, asst. special agent from ICE L.A.
"We know that the tentacles of L.A. gangs stretch out from here."