Within minutes of each other, a US Navy helicopter and a fighter plane went down Sunday during separate routine operations over the South China Sea, and all crew members were rescued safely.

According to official information, the MH-60R Sea Hawk helicopter crashed at around 2:45 p.m. local time.

Following the incident, at 3:15 p.m., an F/A-18F Super Hornet fighter jet assigned to the Fighting Redcocks of Fighter Attack Squadron (VFA) 22 also went down in the South China Sea while conducting routine operations from the aircraft carrier Nimitz.

The USS Nimitz, one of the world's largest warships, is the oldest U.S. aircraft carrier in service and will be decommissioned next year.

"All personnel involved are safe and in stable condition. The cause of both incidents is currently under investigation," the U.S. Pacific Fleet said in the statement.

The Navy has launched an investigation to determine the cause of both incidents.

The plane crashes come amid President Donald Trump's diplomatic tour of Asia, where he is expected to meet with Chinese leader Xi Jinping this week for talks focused primarily on the commerce.

These latest accidents are the latest in a string of incidents for the armed forces this year, the most striking being on January 29 on the Potomac River when an Army Sikorsky UH-60 Black Hawk helicopter collided mid-air with a Bombardier CRJ701 aircraft operated by PSA Airlines near Ronald Reagan Washington National Airport, killing 67 people.

These accidents also come after the Navy lost two Super Hornet aircraft in the Red Sea this spring. An F/A-18 fighter jet costs more than $60 million, according to the Navy.