Police say ten passengers were on the TransPeak bus at the time of the collision in George's Road.
One man was briefly trapped on the top deck before he was rescued by firefighters.
Three women and three men were taken to hospital for treatment to cuts and bruises.
The bus driver was not injured.
"It is only by sheer luck that no-one was seriously injured.
"If you were in the area at the time of the crash and witnessed the incident I would urge you to contact the police with any information."
More top news
Liverpool mounted another stirring comeback at Anfield, beating Villarreal 3-0 to reach the UEFA Europa League Final
Hundreds of mourners have gathered for the funeral of Hamzaa Iqbal, Munib Afzal Karim and Hamza Gujjar who died after in a car crash.
Would you step-in and possibly prevent a crime, or help a stranger in need, even if means putting yourself at risk?