Sputnik Grigory SysoyevA bus has driven into a pedestrian underpass in the center of Moscow
The incident occurred on one of the Russian capital's busiest roads near the Slavyansky Boulevard metro station.
Russian authorities say a bus careened off a road and onto steps leading into an underground passageway in Moscow, killing at least four people and leaving 13 others injured. According to various sources, he could have pushed the wrong pedal or taken off the bus from a handbrake, after which it rolled out into the underground passage. There is no suggestion it was a terror attack.
The police detained the driver of the bus.
He tried to apply the brakes but they did not work, the investigative committee said.
The harrowing video shows a number of people appearing to be crushed by the bus as it disappears into the subway.
The victims included a woman in her thirties and a teenager.
The bus driver has been arrested.
The Interfax news agency said investigators were looking into whether the incident had occurred as a result of a technical fault with the bus. Moscow mayor Sergei Sobyanin told reporters at the scene that an inspection of the entire Moscow bus fleet had been ordered.
"According to preliminary information, five people died". He has been held by police.