The U.S. State Department is launching a new campaign to warn Americans not to go to Venezuela. Officials say anyone who does risks kidnapping, imprisonment, and even torture.

The new designations come as a diplomatic rebuke for some allies and have heightened tensions with adversaries.

The Pentagon is aware of reports Wednesday that an American service member was recently detained in Venezuela, a U.S. official told ABC News. The Department of Defense is "working closely" with the ...