Four people have been killed and the military has denied reports that the machine was carrying radioactive materials when it crashed near Glamis, about 35km from the Mexican border.
“Contrary to rumors on social media, there were no nuclear materials on board,” a military spokesman said.
The crashed machine was identified as an MV-22B “Osprey” by Camp Pendleton Marine Corps.
The propeller “Osprey” has the ability to take off and land vertically, which is provided by the rotation of the wings, which in turn gives the machine the maneuverability of a helicopter, while having a range of flight.
With this machine, the US military has had accidents before, the last of which was in Norway in March, when 4 Marines were killed.