The U.S. Department of Justice announced on Friday that Kyle Benjamin Douglas Calvert pleaded guilty in federal court to the malicious use of an explosive device after detonating a bomb outside the Alabama attorney general’s office in February.

Attorney General Merrick B. Garland stated in the press release that “[p]ublic servants should never be targeted for doing their jobs.” He added, “The Justice Department will not tolerate such conduct, and we will use every resource at our disposal to prevent these attacks and hold perpetrators accountable.”

FBI Director Christopher Wray also said, “Violence and destruction of property will never be tolerated, and the FBI and our partners will continue to work together to ensure anyone who attempts to harm or intimidate the community will be held accountable.”

According to a memo filed by prosecutors, Calvert assembled the bomb using nails, firecrackers and screws and then detonated it outside Alabama Attorney General Steve Marshall’s office in downtown Montgomery during the early hours of February 24. No one was injured, and nearby buildings sustained no damage.

Calvert admitted in the plea agreement to personally constructing the device, using materials like nails and screws as shrapnel, along with accelerants to trigger an explosion. Before planting the device, Calvert placed stickers on several state buildings, featuring various graphics and promoting different political ideologies, including some with the phrase “Support your local antifa.” However, Calvert asserted that he has no ties to Antifa, an anti-fascist political movement in the US. After positioning the explosive device near the office, Calvert ignited the fuse and left the area. Law enforcement arrested him on April 10.

Calvert is facing a prison sentence ranging from a minimum of five years to a maximum of 20 years with no chance of parole. His sentencing hearing will be scheduled at a later date.