Iran is working on advanced uranium centrifuges at new underground sites being built near its Natanz nuclear plant, Israel's defense minister said on Tuesday, giving figures that appeared to go beyond those published by a UN watchdog.
Centrifuges are used to purify uranium for civilian projects or, at higher levels, to make bomb fuel. Iranian progress in the field is being watched by world powers trying to resurrect a nuclear deal with Tehran, which denies having military designs.
