The Central Bureau of Investigation on Saturday named consultancy firm PricewaterhouseCoopers as a suspect in the corporate espionage case.
Earlier on Friday, a Delhi Court had sent two government officials, Lala Ram Sharma and Ashok Kumar Singh arrested by the CBI in the corporate espionage case to police custody for five days.
The CBI had carried out raids at six locations in Delhi and two in Mumbai and recovered Rs. 60 lakh in cash.
The Delhi Police had earlier last month arrested two more persons - one from the UPSC and the other from the Environment Ministry - broadening its probe into the corporate espionage case.
They were held for leaking sensitive documents to energy consultant Lokesh Sharma.
Around 17 people, including government employees, energy consultants and senior executives of top energy companies, have been arrested so far by the Delhi Police.