“People want the Prime Minister to speak and intervene in Vyapam. The PM should no more remain silent. Vyapam scam and all deaths so far ought to be thoroughly investigated. Guilty must be punished. Something must be done to prevent more deaths,” Kejriwal tweeted.Journalist Akshay Singh, investigating the scam, and Arun Sharma Dean of Netaji Subhas Chandra Bose Medical College, Jabalpur, died a mysterious death on Saturday and Sunday respectively.