Two women were trapped on a bus, which crashed into shops on a busy Battersea high street during rush hour.
They have now been rescued.
The driver has been taken to hospital and a number of passengers were treated at the scene.
Witness Matthew Corner tweeted: “Bus crash on Lavender Hill looked awful. Hoping no one is badly hurt. Emergency services doing an excellent job. Lavender Hill.”
Two fire engines and three fire rescue units were sent to the scene.
Police were called just before 7am to reports of a bus hitting a building in Lavender Hill, near Clapham Junction train station in south-west London.
Two passengers were rescued after being trapped on the upper deck of a bus after it smashed into a shop in a busy London high street.
A total of nine people suffered minor injuries when the bus hit the building in Lavender Hill, near Clapham Junction railway station in south-west London shortly before 7am on Thursday.
The bus involved was the number 77 travelling towards London Waterloo.
Andrew Matthews, 34, of Wandsworth Town, said he was one of around a dozen passengers on the bus.
He told the Press Association: “I was on the top floor at the back, fortunately.
“I noticed the bus drifting. I heard a smash and saw the roof of the shop going through (the bus) from the front left. It went to the fourth or fifth row.
“I wedged myself in, bracing myself.
“As soon as the bus came to a stop there was yelling, screaming.
“I noticed a lady wedged in the front right-hand side. She was screaming for help. There was a lot of blood.”
Witnesses reported seeing smoke coming from under the bus.
Solange Morin, 33, lives close to the scene and was hoping to catch the bus before she saw it crash.
She said: “I saw this woman (in the bus) shouting and banging on the glass.
Officers are at the scene of a collision involving a bus on Lavender Hill in #Wandsworth – a number of passengers have been treated by LAS.
— Metropolitan Police (@metpoliceuk) August 10, 2017
“Everybody shouted ‘fire, fire’.
“I went on to the bus. I talked to her and was holding her hands.
“She was pinned. I wouldn’t have been able to get her out.
“She was so scared because people were shouting fire. There was a lot of smoke.”
Photos on social media show the vehicle on the pavement and smashed into the front of the Poggen Pohl Kitchen Design Centre.
Poggenpohl UK managing director Simon Richmond said: “We are relieved that no one from our team was injured as the showroom had not yet opened for the day, but our thoughts…