Authorities search TNK-BP's Moscow office
Interfax is reporting that the officers who entered the building are from the Interior Ministry and are seizing documents as part of a criminal case against the Sidanko oil company.
TNK-BP has confirmed to Russia Today that a search is underway, but would not comment on the nature of the investigation.
The Federal Tax Service accuses TNK-BP of tax evasion. A case was launched after the company conceded the Kovykta gas field to the Russian gas monopoly Gazprom.