Two Malaysian navy helicopters collided in mid-air while flying in formation during a military parade rehearsal, killing all 10 crew members on board.
One of the planes severed the rotor of the other before both crashed to the ground, footage published in local media showed.
The incident took place at 09:30 local time (02:30 BST) in the Malaysian town of Lumut, which is home to a Royal Malaysian Navy base.
There are no known survivors.
“All the victims were confirmed dead at the scene and the remains were sent to the (Lumut) military hospital for identification,” the Royal Malaysian Navy said.
He added that he would form a committee to investigate the cause of the incident.
One of the helicopters, a HOM M503-3 with seven people on board, reportedly crashed on a race track.
The other, a Fennec M502-6 carrying the other three victims, crashed into a nearby swimming pool.
The state fire and rescue service said it was alerted to the incident at 9:50 a.m. local time (01:50 GMT).
Malaysian Prime Minister Anwar Ibrahim said in a message on X, formerly known as Twitter, that “the nation mourns this heartbreaking and heartbreaking tragedy.”
“Condolences to all the families of the victims and prayers for the strength to face this calamity,” he said.
In March, a Malaysian Coast Guard helicopter crashed into the sea off the Malaysian island of Angsa during a training flight.
The pilot, co-pilot and two passengers on board were found and rescued by fishermen.
