Horrific CCTV from the scene captured the bus veering off a road and smashing down steps into people.
A passenger bus that swerved off course and drove into a busy pedestrian underpass in Moscow on Monday has killed at least four people.
The bus driver operating the vehicle told investigators that the bus started moving suddenly and that he applied the brakes, but they did not work.
Either the vehicle's brakes failed or a auto cut ahead of the bus, causing it to veer off its intended path.
The incident occurred on one of the Russian capital's busiest roads near the Slavyansky Boulevard metro station.
The harrowing video shows a number of people appearing to be crushed by the bus as it disappears into the subway.
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While health officials said four people had died, interior ministry spokesman Col Yuri Titov said the accident had claimed five lives.
At least 15 others were injured.
Moments after the incident the driver of the bus was detained by the police.
Monday was a working day in Russian Federation because Orthodox Christmas is celebrated on January 7, according to Reuters.
Ten ambulances, fire service personnel, and three medevac helicopters were on the scene, agencies reported.
Moscow mayor Sergei Sobyanin tweeted: "There are dead and wounded".