Iran is cautioning the UK, Israel and the US that they will be met with a "crushing response" should the powers retaliate for Friday's attack on a Japanese-owned tanker.

An unnamed Iranian security source told state-run, English-language PressTV that it considers any threats made by the countries "to be mostly of propaganda value".

"Any measure against Iran's interest and national security will be met with strong and crushing response, with Washington and London being directly responsible for the consequences of such moves," the source close...