The man accused of planting a bomb outside of the Nederland Marshal’s Office last month has been indicted in the U.S. District Court in Denver.

Federal court documents about the indictment were obtained by 9NEWS on Wednesday morning. The suspect, 64-year-old David Michael Ansberry, was indicted for use and attempted use of a weapon of mass destruction.

If convicted, Ansberry could face up to life in prison and a $250,000 fine, according to court documents. He has not been transported to Colorado yet, federal authorities say, therefore no court date has been set.

The explosive device was found in a backpack on Oct. 11 near the Nederland Marshal’s Office. A detective brought it inside, believing at the time that it was lost property.

It was later detonated in the parking lot.

The situation prompted authorities to evacuate the entire Caribou Ridge Shopping plaza. About 1,200 Nederland residents received a notification about the detonation.

Ansberry was arrested a week later. Law enforcement officials say he was spotted on surveillance video from the store where he bought a cellphone used in the device.

The make-shift bomb was supposed to be remotely detonated using a cellphone, but failed.

The Associated Press reports that law enforcement sources say it was easy to spot Ansberry because he is 3 feet, 6 inches tall.

He was arrested in Chicago.