Nottinghamshire Police have closed parts of Parliament Street after a crash involving two buses.
Emergency services are at the scene following the incident, which police say happened when two buses collided and one went into a shop.
Onlookers described seeing a bus crash into another bus on Parliament Street at its junction with George Street before going into the Argos shop nearby, in Lower Parliament Street.
Nottinghamshire Police have since confirmed that a number of people are being treated for injuries at the scene.
None of the injuries are thought to be life-threatening or life-altering.
A police spokesperson said: "Upper Parliament Street is closed after a collision between two buses.
"Officers from Nottinghamshire Police were called just before 4.10pm today (9 September) to a report of a collision between two buses where one of the buses went into a shop.
"A number of people are reported to have received injuries, none of which are believed to be life-threatening or life-altering.
"Officers are currently at the scene managing traffic and establishing the circumstances around the incident.
"Anyone who saw what happened who has not already come forward should call Nottinghamshire Police on 101, quoting incident number 497 of September 9, 2020."
Nottingham City Transport reported that "all services" in the city have been impacted by the collision, with a number of diversion routes set up by the company.
A spokesperson said: "There are delays and disruption to all services due to an RTC on Parliament Street in the City Centre.
"Please use the following stops to board buses. If your service is not listed, please use your usual stop.
"Green 5, 6, 7, 8, 9, 10, 11 - Angel Row, Broadmarsh or Railway Station
"Lilac 25, 26, 27 - King Street only
"Orange 34 - Angel Row only
"Blue 39, 40, 41, 42 - Queen Street only
"Red 43, 44 - King Street only
"Navy 49 - Angel Row, Broadmarsh or Railway Station
"Grey 50 - Angel Row or Broadmarsh
"Turquoise 77, 78, 79 - Upper Parliament Street, West End Arcade."
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