On 4 September 2024, the Santa Clara County District Attorney’s Gun Violence Task Force and Santa Clara County Sheriff’s Office deputies discovered bomb-making material (BMM), including fuses, cylindrical tubing, and several pounds of black powder; four firearms; ammunition; and narcotics while searching a home on the 2200 block of Bailey Avenue in San Jose. Officials obtained a search warrant after developing probable cause that the resident was manufacturing IEDs and firearms.

On 10 September 2024, at approximately 0000 hours local time, an IED was functioned outside an event venue near Agia Marina in Koropi. The IED was emplaced on a bench outside the venue, and the blast caused significant damage to the venue’s fencing and shattered the windows of two nearby properties. According to the responding police ordnance disposal team, the device included a slow-burning fuse, a detonator, and unidentified explosive materials. The investigation is ongoing. 

On 30 August 2024, Mason County Sheriff’s Office (MCSO) deputies responded to the Star Lake neighborhood in Elma for a report of an explosive device. MCSO deputies determined that the device was a viable IED and learned from community members that three other explosives had been functioned in the neighborhood within the previous 12 hours. Washington State Patrol (WSP) Bomb Squad technicians responded to the scene and disposed of the device. Authorities determined that an unidentified suspect or suspects had functioned the devices from their vehicle while driving through the area.

On 24 August 2024, at approximately 0300 hours local time, multiple fire departments responded to a fire at a grocery store on the 5300 block of 4th street in Renton. Investigators determined that the fire was caused by an unspecified improvised incendiary device (IID) that functioned at the rear of the store. The blaze caused significant damage to the structure of the building and its contents. The investigation is ongoing.

On 28 August 2024, at approximately 1033 hours local time, Rowan County Sheriff’s Office (RCSO) received a report of an explosion inside a mailbox at a residence on the 1800 block of N.C. Highway 152 West near China Grove. RCSO deputies and Cabarrus County Bomb Squad technicians responded to the scene, where they determined the initial explosion was caused by a pyrotechnic device. A secondary search uncovered a second device, described as a commercial pyrotechnic mortar inside an adjacent mailbox.