On 28 June 2024, at approximately 0800 hours local time, Haverhill Police Department (HPD) officers and Haverhill Fire Department crews responded to Rosebud Avenue after a woman informed HPD her husband had explosive devices in and around their home. Massachusetts State Fire Marshal’s Fire and Explosion Investigation Unit technicians responded to assist and disposed of three explosive devices and explosive material via controlled detonations. The 60-year-old male suspect was arrested after Massachusetts State Police officers pulled him over on Interstate 495 in Wrentham.

On 6 July 2024, at approximately 1830 hours local time, authorities received reports that an improvised incendiary device (IID) described as a Molotov cocktail was functioned on the railroad tracks between Pleasant Street and the Maine Behavioral Health building in Rockland. The IID consisted of a gasoline-filled bottle with a burning cloth stuffed inside. The Rockland Police Department and Rockland Fire Department responded to the scene and extinguished the fire. They also located a second similar IID, which had not been ignited, further west on the tracks.

On 20 June 2024, the Riverside Police Department, Riverside Fire Department Arson Investigations Unit, and State Fire Marshal’s Office agents discovered approximately 1,000 lb of pyrotechnics and 100 M-80 explosive devices while searching a residential property in the 5800 block of Clifton Avenue in Riverside. The bulk of the explosives were found on the backyard patio. A 23-year-old male suspect was arrested on suspicion of possession of destructive devices, possession of unlicensed pyrotechnics, possession of an illicit firearm, and child endangerment.

On 3 July 2024, detectives with the Kern County Sheriff's Office (KCSO) Rural Crime Investigation Unit discovered multiple IEDs, including one described as a pipe bomb, as well as bomb-making material (BMM), copper wiring, and tools for electrical wire theft while searching a home in the 8200 block of Halleluiah Street in southeast Bakersfield. Two male suspects, ages 26 and 32, and a 53-year-old female suspect were arrested. The Kern County High Intensity Drug Trafficking Area Task Force, Kern County Probation Department, and KCSO Lamont Substation assisted with the incident.

On 4 July 2024, at approximately 2100 hours local time, in a neighborhood near Heartland Drive and Tetotom Park Way in Antelope, several juveniles threw improvised incendiary devices (IID) described as Molotov cocktails and launched pyrotechnics described as aerial and mortar pyrotechnics into oncoming traffic. The suspects fled when the Sacramento County Sheriff’s Office (SCSO) responded to the scene. SCSO deputies detained several suspects, one of whom was found in possession of a handgun and was subsequently arrested.