NEW : 5 children in critical condition . The death toll is down from 43 to 42 . Comment: Beijing , China ( CNN ) -- Investigators were trying to determine Wednesday what caused China 's first fatal passenger plane crash in almost six years . Survivors cite violent shaking prior to impact .
NEW : 5 children in critical condition . The death toll is down from 43 to 42 . Comment: Survivors cite violent shaking prior to impact .