the basic reportage SEEMS to indicate that a scheduled bus service run by bulgarian operator " Union-Ivkoni " was involved in an RTC [ road traffic
collision ] with a car - and left the carrigeway . outcome = 6 fatal , 20 hospital treatments
looks like it to me. front end seems to match, as well as the compartment under the driver that is open, and driver's window. in fact even the logo on
the side, as well as the blue, curvy line from the bus pictured in your second link, looks the same as this crashed bus. could easily be the exact
same unit.