The U.S. military struck a vessel in the eastern Pacific Ocean, killing one man and leaving two survivors, U.S. Southern Command announced, in the latest use of lethal force under Operation Southern Spear.

Southern Command said forces targeted the boat on the grounds that it was carrying illegal narcotics. The command did not identify the dead man or the two survivors by name.

The strike drew renewed criticism of the operation, which authorizes the military to interdict and, in some circumstances, use deadly force against suspected drug-trafficking vessels in international waters. Critics, including some members of Congress, have questioned whether the rules of engagement are proportionate and whether sufficient oversight exists, according to reporting by The Hill published this week.

Southern Command has not disclosed how many vessels have been struck under the operation or the total death toll across engagements.

Congressional scrutiny of Operation Southern Spear is expected to intensify in coming weeks, with oversight hearings on military counter-narcotics authority anticipated before the end of the current legislative session.