A plastic bottle containing dry ice exploded at Los Angeles International Airport Sunday and caused a commotion that temporarily delayed a few flights.
FBI spokeswoman Laura Eimiller said a chemical reaction led to the blast Sunday evening in an employee bathroom in Terminal 2.
No injuries were reported, but as a precaution authorities closed the terminal and examined the area for evidence.
Eimiller said the bathroom was in a restricted area of the terminal that was not accessible to the public.
Airport police Sgt. Karla Ortiz said officials temporarily halted security screening, which led to the delay of up to four departing flights.
Flights had returned to normal by Monday morning.
Investigators were still trying to determine how the bottle wound up in the bathroom.