WASHINGTON (CNN) -- U.S. military commanders in the Middle East were sent a message reminding American forces to maintain discipline and prudence if they encounter any Iranian military forces during potential unrest surrounding Iran's presidential election, CNN has learned.
An incident involving Iranian speed boats and U.S. warships raised maritime tensions in 2008.
This so far is the only acknowledged U.S. military reaction to the unfolding situation in Iran.
Two U.S. defense officials with direct knowledge of the highly classified message confirmed the details to CNN but said the issue is so sensitive that they could not divulge whose signature was on the message. It was distributed via secure communications in recent days. The officials talked with CNN on condition they not be identified.
Both underscored that the message is not an indication U.S. forces are at any high
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