A U.S. Marine training in Australia was arrested Tuesday and has been charged with multiple assaults after allegedly dragging a 60-year-old woman from her car on an Australian army base near Brisbane.

When an off-duty police officer attempted to intervene, the 20-year-old Marine, whose identity has not been released, allegedly assaulted him as well, the Courier Mail reported.

The woman, who works for the Australian Defence Force, was taken to the hospital after sustaining “serious” but non-life-threatening injuries, the report said.

Australian authorities said there was no clear indication as to what caused the melee near the Gallipoli Barracks, and the Marine and the woman did not know each other, the report said.

The 20-year-old is being charged with serious assault in relation to a person over 60, assaulting a police officer and causing damage to the woman’s car, the report said.

The Marine is scheduled to appear in the Brisbane Magistrates Court on July 18.