Satellite photos show activity at Iran's Natanz nuclear facility

UN nuclear agency says Tehran is building underground advanced centrifuge assembly plant

Iran has begun construction at its Natanz nuclear facility, satellite images show, and the UN's nuclear agency has acknowledged that Tehran is building an underground advanced centrifuge assembly plant after its last one exploded in a reported sabotage attack last summer.

Since August, Iran has built a new or regraded road to the south of Natanz towards what analysts believe is a former firing range for security forces at the enrichment facility, images from the San Francisco-based Planet Labs show.