U.S. military officials involved in the attacks on vessels suspected to be trafficking drugs “have been asked to sign non-disclosure agreements, a development that raises new questions about a military buildup that Venezuela fears may lead to an invasion,” Reuters reports.

“The step is highly unusual, given that U.S. military officials are already required to shield national security secrets from public view, and comes as lawmakers in Congress say they are being kept in the dark about key aspects of the mission.”

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