The U.S. military struck another boat in the Caribbean Sea on Thursday, and there were survivors aboard the vessel, a U.S. official confirmed to CBS News. A day later, CBS News learned there were two survivors.

Thursday's strike marks the sixth known boat attack in the area since last month — and the first known attack with survivors. On Friday, President Trump said the strike was against a drug-carrying submarine.

A Navy helicopter transported the survivors from the semi-submersible to a Navy ship, a source familiar with the matter confirmed to CBS News on Friday.

"It is the custom of the sea to save people who are at risk in international waters. You don't sort of sail on. That's against every principle of naval activity," Eugene R. Fidell, a senior research scholar at Yale Law

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