A plastic bottle exploded at a Mattel Inc. facility in El Segundo Tuesday morning, and security officers are investigating whether it was a criminal act or an accidental occurrence.
The incident began when security officers heard an "explosion-type noise" in a design center office area at about 7 a.m., said El Segundo police Capt. Bob Turnbull.
Police officers and sheriff's arson and explosives investigators were called to the scene, where they found an exploded plastic bottle in the northern part of the building at 2031 East Mariposa Ave.
Turnbull said officers closed Mariposa between Nash Street and Continental Boulevard, and are keeping employees out of the building while they look for any more possible explosive devices.
Anyone with information about the incident is asked to call 310-524-2200.