LOS ALAMOS, N.M. (AP) — Nuclear watchdogs are fighting a proposal to ship tons of plutonium to New Mexico, including the cores of nuclear warheads that would be dismantled at an aging and structurally questionable lab atop an earthquake fault zone.

Opponents voiced their opposition at a series of public hearings that opened this week on the best way to dispose of the radioactive material as the federal government works to reduce the nation’s nuclear arsenal.