On 14 March 2024, an FBI tactical team raided a home in Madisonville as part of an investigation into the purchase of materials that were suspected of being used to make explosive devices. The FBI was first alerted about a 66-year-old man making online suspicious purchases of explosive manuals and bomb making material (BMM), including explosive precursor chemicals (EPCs), in January 2024. The suspect did not have a license to deal in the materials and had been arrested previously for the manufacture of IEDs.

On 10 March 2024, at approximately 1100 hours local time, Riverside County Sheriff's Department (RCSD) deputies conducted a traffic stop of a suspect with several warrants out for his arrest near the intersection of Ramona Expressway and State Street in San Jacinto. Deputies found 5 lb of explosive material, 8 firearms, a suppressor, ammunition, and high-capacity magazines while searching the suspect's vehicle. RCSD deputies searched the suspect’s home at the 1400 block of Calle San Sebastian and discovered 20 lb of additional explosive material.

On 7 March 2024, Shenandoah County Sheriff’s Office deputies and Virginia State Police Bomb Squad technicians discovered "evidence of explosives” while searching a residence in Maurertown. No additional details regarding the explosives were released. A 14-year-old boy was arrested and charged with manufacture or possession of a firebomb or explosive.
 

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On 11 March 2024, at approximately 1405 hours local time, Jefferson County Sheriff’s Office deputies received a report that an IED contained in envelope was discovered in a mailbox at a residence on the 1700 block of Old Highway 141 in Fenton. Officers described the envelope as containing three sticks of explosives that resembled “homemade dynamite” and a bottle of possible gunpowder with each item being fused. The St. Louis County Bomb and Arson Unit responded to assist. Bomb technicians examined the device, before removing it from the scene and disposing of it safely.

On 7 March 2024, Wicomico County Sheriff’s Office deputies responded to a residence on the 7000 block of Gumboro Road in Pittsville for a welfare check and discovered multiple IEDs. The 45-year-old male suspect admitted to constructing the devices using explosive precursor chemicals (EPCs), pyrotechnics, shotgun shells, nails, and flammable material. The Office of the Maryland State Fire Marshal responded to assist and rendered the devices safe before removing them. The suspect was arrested, and the investigation is ongoing.