"The two surviving terrorists are being returned to their Countries of origin, Ecuador and Colombia, for detention and prosecution," Trump posted on his social media platform on Saturday afternoon. Trump said the vessel that was stuck was a submarine and said U.S. intelligence indicated it was carrying fentanyl and other illegal narcotics.

The military rescued the pair after striking a submersible vessel in what was at least the sixth attack since early September.

The reported detentions could prompt legal challenges for the U.S., including whether to hold the alleged survivors as indefinite wartime detainees or transfer them to military or criminal authoritie...