Police suspect that he was procuring documents from other ministries as well.
More arrests are likely soon as search and raids are continuing in Delhi and NCR in this connection.
Sources said he quit in 2011, and joined Jubilant Energy as a senior executive the next year, with a monthly salary of Rs 1.5 lakh.
Police sources said the probe would be widened and petroleum ministry officials may be called in for questioning soon.
RIL has a series of ongoing arbitration actions against the government.
Prayas Jain and Santanu Saikia were taken into custody by Delhi Police Crime Branch today.
Police Commissioner B S Bassi said official documents were photocopied and leaked in return for money.
Five arrested including an RIL man and two Petroleum Ministry employees, more arrests likely.
More than 7 incidents, including ire, theft, alleged arson, have been reported in churches over last 3 months.
Since the couple had been married for only a few months, an SDM inquiry has been initiated into the matter.
The PM has directed Delhi Police Commissioner to take strict action against perpetrators of such attacks.
Among the five persons who were questioned along with Tharoor were his two domestic helps, Bajrangi and Narain.
Delhi Cantt recorded 69.68 per cent turnout on Monday, with 632 out of 907 registered voters.
Voters in Mangolpuri and Sultanpur Majra seemed to have warmed up to the Congress.
The former CM also questioned the AAP on the source of its funding.
A rally by BJP’s chief ministerial candidate Kiran Bedi in Paharganj left behind a trail of garbage
Sources said Singh was asked to narrate the sequence of events on the day Sunanda called him.
Heavy deployment was seen in the New Delhi district with one checkpost every 3 km.
NIA has, instead, named absconder Sabir Khan, alleged to be a Delhi Police informer, as main accused.
The questioning will hinge on the five points that police have prepared.
During his 45-minute questioning Zakir Nagar residents gathered in protest outside police station.
Rajesh sharma was killed Saturday, victim of an alleged revenge attack by an aide of a gangster.
Cop among two held for killing undertrial who was being taken to hospital.
300 Delhi Police personnel will hold fort at the Maurya Sheraton 72 hours before Obama's arrival.
Main accused was ‘instigated’ to attack church to prove he is a true Sikh