The U.S. military carried out a strike against an alleged Venezuelan drug cartel boat Thursday in international waters in the Caribbean, and for the first time there were survivors, according to a U.S. official.

The strike is at least the fifth carried out by President Donald Trump's administration against boats in international waters believed to be connected to Venezuelan drug cartels. At least 21 people were killed in previous four strikes, with no survivors.

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NBC News has previously reported that U.S. lawmakers have grown concerned about the lack of information being provided by the White House on the operations.

On Wednesday, Trump made an extraordinary admission , confirming he had authorized the

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