President Donald Trump announced that a U.S. military operation in the Caribbean destroyed a “large drug-carrying submarine,” killing two suspected narco-terrorists and capturing two others. He said the vessel was transporting fentanyl and other narcotics along a known trafficking route and claimed the mission may have prevented up to 25,000 overdose deaths. No U.S. forces were injured. The Pentagon has not released the operation’s name, but it is the sixth drug-smuggling vessel intercepted since combat operations began last month.

According to Fox News, the two survivors are being held on a U.S. Navy ship. Trump first mentioned the strike during a meeting with Ukrainian President Volodymyr Zelenskyy. The announcement comes as lawmakers push harsher penalties for fentanyl trafficking, arguing the drug is a leading cause of death among young Americans.