LINCOLN, Neb. (AP) – A Missouri man who pulled an emergency break and prompted panic aboard an Amtrak train in southern Nebraska has pleaded guilty to a terrorism charge.

The Lincoln Journal Star reports that 26-year-old Taylor Wilson of St. Charles, Missouri, also pleaded guilty Thursday to possessing an unregistered rifle. Prosecutors have agreed to drop other charges.

Investigators say Wilson pulled the break in a secure area of a locomotive on a Chicago-bound train in October. Prosecutors say he was armed with a handgun, ammunition, hammer and knife, and caused panic among the 175 people on board. No one was injured.

Asked by a judge Thursday why he stopped the train, Wilson said: “I was high.”

Federal prosecutors charged Wilson after learning about his involvement with a white supremacist group. He’ll be sentenced Oct. 5.