An explosion deep within Iran’s Fordow nuclear facility has destroyed much of the installation, trapped about 240 personnel deep underground, according to a former intelligence officer of the Islamic regime, and reported by Reza Kahlili on Thursday. The previously secret nuclear site has become a center for Iran’s nuclear activity because of the 2,700 centrifuges enriching uranium to the 20-percent level. A further enrichment to weapons grade would take only weeks, experts say.“The level of enrichment has been a major concern to Israeli officials, and Prime Minister Benjamin Netanyahu repeatedly has warned about the 20-percent enriched stockpile. The explosion occurred...