China Southern Airlines says it has removed its chief financial officer and an executive vice president from their posts amid an ongoing probe by China's top anti-corruption body.

China's largest air carrier says the two are being investigated for "job-related crimes."

The move brings the total number of executives of the state-run Chinese airline under investigation to four.

The company said last week that it removed its chief operating officer as well as an executive vice president from their posts for similar reasons.

The removals come after a month-long on-site inspection by the Communist Party of China's Central Commission for Discipline Inspection that started in late November.