Airlines check some Boeing 737 engines after fatal Southwest accident

SINGAPORE/PARIS, April 18 (Reuters) - Global airlines began inspecting some Boeing 737 engines on Wednesday as an investigation gathered pace into an explosion which killed a passenger on a Southwest Airlines flight in the first fatal U.S. airline accident in almost a decade. European regulators earlier this month ordered checks following lengthy analysis of a similar non-fatal incident at Southwest two years ago but investigators warn it is too early to say whether the two problems are linked.