A 49-year-old man was taken into custody after two small explosive devices were detonated Thursday afternoon inside a Sam's Club in Ontario, authorities said.
According to an Ontario Police Department spokesperson, the incident was initially reported at 2:08 p.m. as a structure fire after the caller heard a "popping sound" on aisle 4 of the warehouse store in the 900 block of Milliken Avenue.
Bomb squad personnel later confirmed that two homemade devices were detonated, but there were no injuries or significant damage.
"Each device had ignited small fires to products within close proximity," the police department said in a statement. "Sam's Club employees acted quickly and used fire extinguishers to put out the flames."
Evacuated employees stood in the taped-off parking lot as the investigation got underway.