(AP) – President Donald Trump took to social media on Monday to warn that “every time Iran kills an American Soldier” going forward “they will pay for that killing many times over.” Trump offered no further details but said his directive has been relayed to U.S. military leaders.

The warning comes after the U.S., early Monday, launched its ninth night of airstrikes on Iran after announcing the death of another American service member killed in Iraq during the “controlled detonation” of a downed Iranian drone. The U.S. military also identified two soldiers who were killed in Jordan on Friday while defending against Iranian ballistic missile and drone attacks. Seventeen U.S. troops have been killed since the start of the war.

The renewed exchanges of fire, now in their second week, have seen the U.S. target Iranian bridges, electrical facilities and, as of Monday, the city believed to host its underground missile bases, as the countries inch closer to a return to full-scale war. Iran on Monday retaliated with attacks on American allies Kuwait and Bahrain, home of the U.S. Navy’s 5th Fleet.

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