An unmanned Russian cargo spacecraft crashed in eastern Siberia shortly after liftoff Wednesday, DPA quoted Russia's space agency Roskosmos. An ignition problem occurred in the third stage of the rocket carrying a Progress M 12-M spacecraft. Launched from the Baikonur Cosmodrome in Kazakhstan, the vessel was bound for the International Space Station with 2.6 tons of cargo for the orbiting crew. There were no injuries on the ground. Roskosmos said that the causes of the accident were under investigation, and future Progress launches have been postponed. It was not immediately clear what the disruption of the Russian supply vessels means for resupply of the ISS.