Kiev - Masked men believed to be government agents broke into the headquarters of Ukraine national natural gas company Naftogaz Ukrainy on Wednesday and are searching the premises, witnesses said.
The men were armed and wore camouflage uniforms commonly used by Ukrainian special force police and military units.
The assault teams were moving through Naftogaz offices, the witnesses said.
The entire senior board of Naftogaz had been placed under arrest, according to an unconfirmed Interfax report.