A U.S. Navy helicopter and a fighter jet both crashed in the same half hour on Sunday during separate routine operations over the South China Sea, with all crew members safely rescued, the Navy’s Pacific Fleet said.

The Navy has launched an investigation into the cause of both incidents that occurred over strategic waters seen as a potential flashpoint for global conflict.

U.S. President Donald Trump called the back-to-back crashes “very unusual” and raised the possibility of a fuel problem while speaking to reporters aboard Air Force One, en route from Malaysia to Japan on Monday.

“They think it might be bad fuel. We’re gonna find out. Nothing to hide, sir,” Trump said in response to a question.

The Navy said on social media that a MH-60R Seahawk helicopter went down around 2:45 p.m.

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