Helena Police Search for Missing 12-Year-Old Thomas Finn McMahon

Helena police and the Lewis and Clark County Sheriff's Office launched a search Thursday for Thomas Finn McMahon, a 12-year-old boy missing from Helena. A community alert was issued April 9, with a deputy sheriff characterizing the situation as urgent and calling on the public to assist in locating the child.

The Montana Department of Justice maintains a statewide missing persons database, and cases involving children in the Helena area are coordinated between the Helena Police Department and the Lewis and Clark County Sheriff's Office. Anyone who has seen Thomas or knows his whereabouts is asked to call the Lewis and Clark County Sheriff's Office dispatch at 406-447-8293 or the Helena Police Department at 406-447-8461. In an emergency, call 911.

When a child is reported missing in Montana, law enforcement must first determine whether the case meets the criteria for an AMBER Alert. If those criteria are not met, agencies can request a Missing-Endangered Person Advisory, known as a MEPA. The AMBER Alert program began in Texas in 1996 following the abduction and murder of 9-year-old Amber Hagerman. In Montana, officials also have the option of issuing a MEPA advisory. MEPA uses some of the same notification procedures as the AMBER Alert program, with the Division of Criminal Investigation notifying all Montana law enforcement agencies and issuing advisories through the National Weather Service, Montana Department of Transportation, and the Montana Lottery. The distinction matters to those following the case: the absence of an AMBER Alert does not mean Thomas is considered safe. It means investigators have not confirmed the specific circumstances that trigger that threshold.

Tips that actually help investigators are specific: a precise street address or intersection where Thomas was seen, a description of any vehicle involved, or a time-stamped account of contact. Sharing unverified location claims on social media or speculating publicly about circumstances can misdirect search resources and complicate an active investigation. A direct phone call to law enforcement remains the most useful action any witness can take.

The search remained active as of Thursday. Authorities have not released additional details pending further investigation.