Washington (CNN) Thousands of Marines have been put on a higher state of alert around the world in advance of the anticipated release of a Senate report on coercive interrogation techniques as a precaution, a U.S. defense official tells CNN.

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White House spokesman Josh Earnest at the briefing Monday said the Senate committee has told them they will release the enhanced interrogation report Tuesday.

The Marines are all part of contingency response forces positioned in key areas to respond to a crisis. The alert status means the units are put on a shorter readiness time to be available and capable of deploying to a crisis such as an embassy or U.S. base coming under threat. Those exact warning times remain classified, but the Marines can be able of deploying within just a few hours of being notified.

The Marines on alert include approximately:

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