The bus was carrying spectators and workers from horse races when it overturned in the New Territories area in Hong Kong.
Passengers quoted in local media say the bus was travelling very fast before it tipped over.
The driver has been arrested on charges of causing death and grievous bodily harm by unsafe driving.
She told reporters that an independent investigation led by a judge would carried out to establish what caused the crash.
'It was much faster than I normally felt in a bus, ' an injured passenger told the South China Morning Post's online edition.
Photographs of the incident showed the bus on its side with the roof torn off.
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The bus was headed to Tai Po from Sha Tin Racecourse.
He also called on the government to immediately follow up on, and regulate the working time limit for bus drivers - for example, by requiring regular health checkups to ensure the safety of drivers and passengers. More than three-quarters of bus drivers work 50 to 60 hours a week, according to a 2016 survey conducted by the Hong Kong Confederation of Trade Unions.
Firefighters sort through crash debris after a bus crash in Hong Kong on February 10, 2018.
Carrie Lam, Hong Kong's top official, said after the crash a year ago that she didn't believe new laws governing drivers' hours were an answer, and that any solution had to address broader questions of worker shortages.
The city's worst road traffic accident occurred in 2003 when a double-decker bus collided with a truck and plunged from a bridge, killing 21 people.