Around 200 brokers are said to be involved in the scam; they have been summoned for questioning. Major brokerages questioned by the EoW so far include Anand Rathi, Motilal Oswal, India Infoline and Geojit Comtrade.
'If we have to restrict and fight terrorism, first and foremost, we have to ensure communal harmony in the country.'
Bajpai, who is the most prominent face of the online survey company's India operations, was arrested under Indian Penal Code for cheating and conspiracy.
Mukerjea, who was admitted in the state-run J J Hospital for the treatment of suspected drug overdose has been brought back to the jail, Inspector General (prisons) Rajvardhan Sinha said.
Two days after Mumbai Police attached his properties, Jignesh Shah, director of the beleaguered National Spot Exchange Ltd, on Thursday told investigators that he was making "relentless" efforts to recover money from defaulters.
In the first arrest in the NSEL's Rs 5,600 crore (Rs 56 billion) payout scam, a top official of the beleaguered spot commodity bourse, which defaulted on its payment for the eighth time in a row yesterday, was held on Wednesday by Mumbai police's Economic Offence Wing (EOW).
Total scam in collusion with middlemen is estimated at over Rs 700 crore. Probe is on in 10 more cases.