ISTANBUL (REUTERS) - An explosion occurred in an area of Istanbul's Sabiha Gokcen airport where airplanes were parked, wounding two cleaning staff on a nearby plane, but the cause of the blast was not clear, Pegasus airline said on Wednesday (Dec 23).

It said the blast occurred at 2.05am when no passengers were in the area and that operations were continuing normally at the airport, on the Asia side of the city.