The FBI has arrested a man in Arizona over a religiously motivated terror attack on a remote Australian property last year that left six dead.
Mr Day was arrested by FBI agents in Heber Overgaard, north-east of Phoenix, on Friday and could face up to 10 years in prison if convicted on both charges, according to prosecutors.
In one YouTube video, Mr Day threatened to harm any law enforcement officials who came to his residence following the ambush in Queensland last December, the document added.
There is also evidence that the Arizona native and Gareth were "commenting directly" on each other's YouTube videos, Queensland Police Assistant Commissioner Cheryl Scanlon told a press conference on Wednesday.
The attack took place after police arrived at a remote inland property owned by Gareth and Stacey Train in Wieambilla - about 270km (168 miles) west of Brisbane.
Queensland Police have since labelled the incident a "religiously motivated terror attack" and allege the Trains subscribed to "a broad Christian fundamentalist belief system known as premillennialism".
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