The collision took place just before 6pm yesterday.
One man, aged 60, was seriously injured. He remains in critical condition at Queen Elizabeth University Hospital.
A further six people, including a 52-year-old woman and five men, aged 30, 32, 33, 33 and 41 were taken by ambulance to the hospital.
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Person fighting for their life after Cook Street bus crash
There were 11 passengers on the bus, four others were checked at the scene and had no reported injuries.
The driver is uninjured.
Nearby roads, which were closed overnight due to the incident reopened around 12.30am today.
The investigation continues.
