Recent weeks have seen a series of mysterious explosions in Iran, with some at sites linked to their nuclear and missile programme.

Security Correspondent Gordon Correra reports on whether a secret war could be under way in the country.

"The war has begun, and it didn't start a few weeks ago... this is a war that has been going on for four or five years," Israeli security expert Yossi Melman told him.

But Former CIA officer Bob Bear warned that such a war, if it were taking place, could easily escalate, with Iran responding to attacks with their own covert war in the region.

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