Terrorism is not being considered, it is understood, but the driver was detained by police.
At least four people have been killed and 15 injured after a bus crashed into an underground passageway in Moscow.
"According to preliminary information, five people died".
Moscow police said passengers and pedestrians were among those killed in the crash.
Horrific CCTV from the scene captured the bus veering off a road and smashing down steps into people.
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"The driver of the bus began movement and then changed his trajectory, which resulted in the bus going down into the pedestrian underpass", the statement said.
He tried to apply the brakes but they did not work, the investigative committee said.
The incident happened on Kutuzovsky Avenue, near the Slavyansky Bulvar metro station in the western part of the Russian capital.
Officials said there is no suggestion it was a terror attack while Russian investigators said the driver told police the vehicle had started to move suddenly.
Sirens were blaring around the metro station, with authorities preparing to pull the bus out of the underpass, an AFP correspondent at the scene said. "We are providing emergency aid", he said, offering condolences to families of the victims.