Former prime minister Najib Abdul Razak and Swiss national Xavier Andre Justo locked horns on Facebook after Najib called the latter a thief and blackmailer, alleging Justo of having stolen data from PetroSaudi International for ransom.

Justo is a former PetroSaudi director who was responsible for leaking over 200,000 of the company's email communications, among others, in 2015 which sparked a multi-national investigation into 1MDB - a Malaysia's sovereign wealth fund that was founded by Najib.

For the record, PetroSaudi is a private Saudi oil extraction company...