Natanz nuclear plant attack ‘will set back Iran’s programme by nine months’

US intelligence sources believe Israel was behind Saturday's cyber-attack on heavily guarded facility

The cyber-attack on the heavily guarded Natanz plant in Iran will set back Tehran's nuclear programme by nine months, US intelligence sources have claimed.

Iran's foreign ministry has blamed Israel for sabotaging Iran's main uranium enrichment facility, and although Israel has not formally confirmed responsibility its officials have done little to dispel the notion.