The FBI caught a man in Arizona for an attack on a religious property in Australia that killed six people last year.
The 58-year-old person from the United States is accused of two crimes, one of which is about encouraging violence on the internet.
Police say he sent many messages online with Christian end of days beliefs to the attackers.
The attack at Wieambilla resulted in the deaths of two police officers, a neighbor, and the three shooters.
The FBI arrested a man from the US in Heber Overgaard, northeast of Phoenix, on Friday.
Police say three people named Nathaniel, Stacey and Gareth Train, were watching videos on two YouTube accounts created by the man. They said he kept sending messages to Gareth and Stacey before the attack happened in Queensland last December.
The police officer said that there is proof that the suspect and Gareth were leaving comments on each other’s YouTube videos.
Queensland Police are helping FBI and local US police with their investigation. They have gone to the US for this.
On 12 December, a very bad attack happened when the police went to Gareth and Stacey Train’s property in Wieambilla – which is about 270km (168 miles) west of Brisbane.
Four police officers went to see Nathaniel Train, who had been reported missing.
As soon as they got out of their car and walked towards the house, they were attacked with a lot of gunfire.
Two police officers – Matthew Arnold, 26, and Rachel McCrow, 29 – were hit first and then shot again as if they were being executed.
Another police officer got hurt but ran away, while the fourth officer was frightened by the shooters who started fires to try and force her out of hiding.
Alan Dare, who was 58 years old and lived nearby, came to help at the scene and was also shot and killed.
The police used a lot of guns during the siege, which lasted for many hours. The suspects were eventually shot by officers who had special training.
Investigators believe the attack was planned ahead of time and involved careful preparation to target law enforcement officers.
Hidden shelters, walls, mounds of dirt, weapons, surveillance cameras, and mirrors on trees were placed all over the land.
Queensland police said the incident was a “religiously-motivated terror attack” and they believe the person involved followed a Christian belief system called premillennialism.
Premillennialism is the idea that Jesus will come back to Earth after a hard time and make things better.
Australian authorities say this is the first time a violent attack has been connected to an extreme Christian belief in Australia.
The man is accused of breaking the law in the US and they don’t have any plans to send him back to Australia.
There are not many shootings in Australia because it has very strict gun laws.
Date: