Derrick Couture, a 39-year-old man, is currently at large and wanted by law enforcement in connection with an arson incident that occurred in Nashua, New Hampshire, earlier on Monday, September 21, 2026. Authorities have determined that Couture may pose a significant danger to himself and the public. Police believe he has traveled from New Hampshire to Tyngsborough, Massachusetts, where he is thought to be hiding. In response to this potential threat, Tyngsborough police, Nashua police, and a Massachusetts SWAT team have launched an active search operation in the area. Law enforcement officials cleared the neighborhood on Monday night after their initial efforts to locate Couture were unsuccessful. According to statements from Tyngsborough police, there is currently no confirmed information verifying that Couture remains in the immediate vicinity, but the possibility that he is still present cannot be ruled out. The public is urged to remain vigilant and exercise extreme caution. If any members of the community spot Derrick Couture or possess any information regarding his whereabouts, they are instructed to contact emergency services immediately by calling 911. The investigation is ongoing, and authorities continue to coordinate their efforts across state lines to apprehend the suspect. Residents are advised to stay indoors and secure their properties while the manhunt is underway. This situation is developing rapidly, and updates may follow as more information becomes available from the involved law enforcement agencies.