A US Navy helicopter and a fighter jet both crashed in the same half hour on Sunday during separate routine operations over the South China Sea.

Axar.az reports, citing CNN, 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.

The Navy said on social media that a MH-60R Seahawk helicopter went down around 2:45 p.m. local time “while conducting routine operations from the aircraft carrier USS Nimitz.” Search-and-rescue crews rescued three crew members, the Navy said.

About 30 minutes later, an F/A-18F Super Hornet fighter also crashed while conducting routine operations from Nimitz. Both crew members ejected and were safely recovered, the Navy said.