According to Aviation Safety Network, Vietnam Airlines experienced six accidents/incidents since 1951, with two of them leading to fatalities. Both deadly accidents occurred on final approach, and both involved Soviet-built aircraft. The deadliest one took place on 3 September 1997, when a Tupolev Tu-134B-3 crashed after hitting trees on approach to Phnom Penh International Airport; the death toll rose to 65. The other fatal accident occurred on 14 November 1992, when a Yakovlev Yak-40 crashed on approach to Nha Trang Airport, killing 30 of 31 occupants aboard. The airline has also experienced a hijacking episode in 1992, without any recorded fatality.