Sunday's attack brought the death toll to at least 157 people since the Trump administration began targeting those it calls "narcoterrorists" in small vessels in early September.
President Donald Trump has said the U.S. is in "armed conflict" with cartels in Latin America and has justified the attacks as a necessary escalation to stem the flow of drugs.
The series of strikes conducted Monday brought the death toll to at least 145 people since the administration began targeting those it calls "narcoterrorists" in small vessels.
International law experts and rights groups say the strikes likely amount to extrajudicial killings as they have apparently targeted civilians who do not pose an immediate threat to the United States.
U.S. Southern Command stated on social media that the vessel was operated by narco-terrorists along a known trafficking route, but didn't provide evidence behind the allegations.