A hard turn by an aircraft carrier isn’t enough on its own to cause a $67 million Navy fighter jet to slide off a ship, a Defense Department official said as investigators determine how a plane fell into the Red Sea.

A United States Navy fighter jet and a tow tractor fell off an aircraft carrier and sank in the Red Sea on Monday after the crew lost control of the plane, the Navy said.

The USS Harry S. Truman had turned sharply to evade a Houthi attack in the Red Sea when the F/A-18E Super Hornet fell overboard and was lost, a U.S. official said.