Today we where spotting by runway 19R/01L at spot D, round the clock of 13.34 a KoreanAir Cargo plane (Boeing 747-400 registration HL7499) was taking off. But around the clock off 14.04 it came back and landed at runway 19R/01L, when it was landed there where 7 firetrucks by the plane. After a while they where towing the plane to a lokation near exit A1, hopefully someone can tell us what was rong.