At least 16 people were killed and more than 50 others were injured Wednesday when two buses collided head-on in far eastern Russia, officials said. The Investigative Committee, the nation’s top investigative agency, said the collision occurred on a highway linking Khabarovsk, on the border with China, and Komsomolsk-on-Amur. The agency has opened an investigation of alleged violations of traffic rules. Prosecutors said the driver of one of the buses drove into an oncoming lane to bypass vehicles of a road repair crew and lost control. The bus hit an oncoming bus and overturned. Russia’s Health Ministry said 56 people were injured. Ambulances and helicopters have rushed to the site to evacuate the wounded, more than 20 of whom were in grave condition.