New Delhi, Nov. 21 -- Three Christian extremists shared a delusional disorder when they opened fire on police officers they perceived as "demons intent on killing them" on a rural Australian property three years ago, a coroner found on Friday.

The extremists - brothers Gareth and Nathaniel Train and Gareth's wife, Stacey Train - were among six people killed in a six-hour gunbattle that began on Dec. 12, 2022, in the sparsely populated Wieambilla region west of the Queensland state capital, Brisbane.

The trio killed two police officers, Rachel McCrow and Matthew Arnold, and a neighbor, Alan Dare, who had come to investigate scrub fires the Trains had ignited.

Four police officers had come to Gareth and Stacey Train's home in response to...