A U.S. Navy fighter jet and helicopter crashed into the South China Sea on Sunday, in what were two separate incidents.

The U.S. Pacific Fleet announced that at 2:45 p.m. local time, a Navy Seahawk helicopter went down in the water while “conducting routine operations” from the USS Nimitz, an aircraft carrier. Roughly 30 minutes later, an F/A-18F Super Hornet fighter jet also crashed down in the waters while flying from Nimitz.

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