Another senior official of the Hyderabad-based construction company IVRCL, responsible for construction of the Vivekananda flyover which partially collapsed on March 31, was arrested on Thursday. Nine other IVRCL officials had been arrested earlier. Manager, Civil Execution of IVRCL Niloy Roy was arrested by Kolkata Police sleuths from the central part of the city on Thursday evening when he was waiting to meet somebody, a senior police officer said. Investigations have revealed that Roy was present at the site on the dreadful day when concrete laying was on, he said. “Labourers who were working there have told us they had informed Roy about problems with the metal bolts. But, now Roy is denying that he was informed of it,” the officer said, adding Roy had been involved in the project since it started. Roy was on the run since a portion of the under-construction flyover collapsed killing 26 people and injuring around 90. “We have found discrepancies in his version. He has not come out when asked to specify about his role he had in the construction of the flyover,” the IPS officer said. Meanwhile, Kolkata Police on Thursday conducted search operations at an IVRCL office and one mixing plantseized several documents. So far IVRCL Director Operations Gopal Krishnamurthy, Deputy General Manager of Project Monitoring Cell S K Ratnam, Assistant General Manager Mallikaarjun Rao, Assistant Manager Debjyoti Manjumdar, Structure Manager Pradip Kumar Saha, Project Manager Tanmoy Sil and senior engineers Shyamal Manna and Bidyut Manna have been arrested.