Boise man who told others to “go down” and shot had a gun on him when he was arrested in the “Terrorgram” case

A Boise man accused of aiding and abetting terrorists and inciting murder appeared in court for the first time Tuesday afternoon, just hours after new court documents shed more light on the “serious danger” authorities say he poses to the public.

Matthew Allison, 37, first appeared at the James A. McClure Federal Courthouse in Boise, where U.S. Magistrate Judge Candy Dale read him the 15 counts against him. Allison made no admission of guilt at Tuesday’s hearing. He will remain in custody pending another hearing later this month.

He was arrested on Friday in connection with suspected terrorist activities on the social media site Telegram.

Allison, wearing an orange Ada County Jail jumpsuit and shackles, watched Dale with a neutral expression as she read the charges, which include multiple counts of solicitation of murder of a federal officer and incitement to commit a hate crime, as well as aiding and abetting terrorism. An indictment says Allison and Dallas Humber, of Elk Grove, California, were active on “Terrorgram,” a series of channels and chats on Telegram dedicated to promoting white supremacy through violence.

Humber was also arrested Friday and faces the same charges as Allison. Humber pleaded not guilty at an initial court appearance Monday in Sacramento.

The grand jury indictment in the case links Allison and Humber to actual and planned terrorist attacks in Turkey, Slovakia and New Jersey. They are accused of radicalizing people online, spreading white supremacist propaganda, sharing bomb-making instructions, maintaining a hit list of assassination targets and celebrating attacks carried out in the name of white supremacists.

Court document: Boise man promises violence and poses flight risk

Allison confessed to the crimes during questioning after his arrest, according to a detention motion filed Tuesday by the office of U.S. Attorney for the District of Idaho Josh Hurwit. The same document was filed by officials in the Eastern District of California, where Allison and Humber were charged.

The court document lays out the government’s arguments for keeping Allison and Humber in custody for the duration of the trial. Federal officials said the pair posed “a grave danger” to law enforcement and the public and cited news reports in which Allison and Humber threatened violence if they were arrested.

According to the motion, Allison was carrying a backpack containing zip ties, electrical tape, a handgun, ammunition, a lock pick set and a knife when he was arrested. Officers said they also found an “emergency bag” in Allison’s apartment that contained $1,500 in cash, a passport, a birth certificate, firearm ammunition and a face mask from Atomwaffen – a neo-Nazi white supremacist group.

Officials said they found similar items in Humber’s possession, along with 3D-printed firearms and a notebook detailing white supremacist attackers with whom she corresponds.

The detention motion argued that Allison and Humber should remain in custody due to the seriousness of the charges against them and the “serious risk” of them fleeing if released.

The court document states that Allison and Humber have no families or deep roots in their hometowns. Humber plans to move from California to Idaho, the motion said.

Both have vowed to promote white supremacy and terrorism until their death and to fight any attempt at arrest, the arrest motion states. Officers cited a message Allison posted in which she urged other users to “go the fuck down shooting” rather than face arrest.

A hearing on the detention request is scheduled for September 18 in Boise.