New Delhi, Feb 19 (ANI): Minister of State for Petroleum and Natural Gas Ministry, Dharmendra Pradhan on Thursday said that investigation is on over the leakage of classified information from Petroleum Ministry. He said that the government will take strong action once the investigation is over. Two Petroleum Ministry employees are among five persons arrested for allegedly leaking confidential government documents to private companies, Delhi Police said. According to sources, said a clerical staff and a peon of the Petroleum Ministry were apprehended by the police. Pradhan, however, said that the new government has started keeping an eye over all the activities in the ministry and said that cameras are installed among other things to keep a check.