Four air crew members are missing after an Australian army helicopter ditched off the Queensland coast

Four air crew members were missing after an Australian army helicopter ditched into waters off the Queensland state coast during joint military exercises with the United States, officials said Saturday.

Four air crew members were missing after an Australian army helicopter ditched into waters off the Queensland state coast during joint military exercises with the United States, officials said Saturday.

The MRH-90 Taipan helicopter went down near Hamilton Island, a Great Barrier Reef tourist resort, at about 10.30 p.m. Friday, Defense Minister Richard Marles said.

A search was underway to find the crew, and their families had been notified, officials said.

A rescue helicopter reported spotting debris Saturday morning near Dent Island in the Whitsunday Islands group.

The Taipan was taking part in Talisman Sabre, a biennial joint U.S.-Australian military exercise that is largely based in Queensland. This year’s exercise involves 13 nations and more than 30,000 military personnel.

Mr. Marles said the helicopter ditched, which refers to an emergency landing on water. He said it was taking part in a mission that involved a second helicopter, which immediately started a search and rescue operation.

“Defense exercises, which are so necessary for the readiness of our defense force, are serious. They carry risk,” Mr. Marles told reporters in Brisbane. “As we desperately hope for better news during the course of this day we are reminded about the gravity of the act which comes with wearing our nation’s uniform."