A Mason City gun shop burglary case took a dark turn when officers searching a 19-year-old suspect's phone for stolen firearm evidence instead found child pornography, setting off a federal investigation that ended this week with a 22-year prison sentence. Parker Jon Thompson, now 20, was sentenced in federal court to 264 months in prison after admitting he recorded multiple children engaged in sexually explicit conduct and asked a child to send him depictions of sex acts, according to court records.
The case began in June 2025 when Thompson helped friends plan a burglary at a Mason City gun shop, and those friends later gave him at least two of the stolen guns, as reported by KIMT. Mason City police had responded to a burglar alarm at Hart Brothers Weaponry on South Federal Avenue just after 1 a.m., where officers found the front door open and a display case smashed, according to NorthIowaToday.com. Search warrants across four Mason City residences and two vehicles turned up seven handguns, six of which were confirmed stolen from the shop, the outlet reported.
A Burglary Probe Takes an Unexpected Turn
Officers investigating the burglary searched Thompson's phone and found child pornography on the device, according to the station's report. That discovery opened an entirely separate federal case, even as the original gun theft investigation continued to move through the state system. Local authorities had initially charged Thompson, then 19, along with three other local teenagers, with state-level counts including conspiracy to commit a nonforcible felony and first-offense trafficking in stolen weapons, per the same account.
The burglary response itself drew a wide net of law enforcement. A multi-agency effort involving seven law enforcement entities, including the Iowa Division of Criminal Investigation, the ATF, and the Special Operations Group of the North Central Iowa Narcotics Task Force, worked the initial case, NorthIowaToday.com reported.
Guilty Plea Reveals a Yearslong Pattern
At his April 2026 guilty plea hearing, Thompson admitted that between March 2024 and September 2025, he enticed minors to engage in sexually explicit conduct to produce visual depictions, and that he possessed child pornography between June 2024 and April 2025, according to KHAM. He ultimately pleaded guilty to sexual exploitation of children, possession of child pornography and possession of a stolen firearm, KIMT reported. Chief Judge C.J. Williams handed down the sentence in Cedar Rapids, the station noted.
Federal charges for sexual exploitation of children carry a mandatory minimum of 15 years in prison and a maximum of up to 50 years, KHAM reported. Thompson's prosecution was also conducted in connection with Operation Take Back America, a federal initiative designed to combat violent crime and criminal organizations, according to the outlet.
No Parole Under Federal Sentencing Rules
Because the federal system has no parole, Thompson must serve his entire 264-month term before beginning 10 years of court-supervised release, according to KIMT. The U.S. Department of Justice confirms that federal criminal law requires defendants to serve their full sentence without the possibility of parole, a rule stemming from Congress's elimination of parole in the federal system under the Sentencing Reform Act, according to the Department of Justice. Thompson is currently being held in U.S. Marshal custody and will be transported to a federal prison, KIMT reported.
Assistant U.S. Attorneys Devra T. Hake and Kyndra Lundquist prosecuted the case, according to the station. The investigation drew on the Bureau of Alcohol, Tobacco, Firearms and Explosives, the Federal Bureau of Investigation, the Mason City Police Department, the Cerro Gordo Sheriff's Office, the Iowa Division of Criminal Investigation, and the Iowa Division of Narcotics Enforcement, per KIMT's reporting.
Part of a Broader Regional Enforcement Push
Thompson's case was prosecuted under Project Safe Childhood, a nationwide program the Department of Justice established in May 2006 to pool federal, state, and local resources through U.S. Attorneys' Offices to combat child sexual abuse and rescue victims, according to North Iowa Now. The program coordinates resources across all 94 federal judicial districts, the outlet noted.
That framework comes amid a broader increase in Project Safe Childhood cases across the district. The Sioux City Journal reported a 22 percent increase in those cases, placing Thompson's sentence within a broader pattern of enforcement across the district.
