Military personnel concluded a conventional strike on Iran's nuclear facilities may fail, and have been forced to change their tactics accordingly, The Sunday Times reported Sunday, quoting western intelligence and defense sources.

“Israel’s plans have been constantly evolving in recent years according to the progress Iran is making,” The Times quote a senior defense source as saying.

According to The Times, western defense experts discovered Iran's Fordow nuclear site is hidden deeper underground than previously estimated and therefore safe from conventional airstrikes.

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