Pressure is growing for an impartial safety probe into the forced landing of a Ryanair jet in Minsk, including a review of the plane¡¯s black boxes ¡ª a move fraught with sensitivities over access to evidence, aviation experts said.

International condemnation of the scrambling of a fighter jet and the use of what turned out to be a false bomb alert to divert the flight to Minsk and detain a dissident Belarusian journalist has focused mainly on accusations of state-sponsored hijacking and rights violations.

But Europe¡¯s aviation regulator said on Wednesday that Belarus¡¯s actions had also cast doubt on its ability to provide safe air navigation, and some international officials are pushing for an investigation close to the type seen when a plane crashes or something goes technically wrong.