A crash in which a woman died and 22 people were injured was caused by a car pulling out in front of a double-decker bus, the bus company has said.
The collision involving the bus and two cars happened near Newport, Isle of Wight, at about 12:45 BST on Sunday.
Four people are in a critical condition, police said.
Bus operator Southern Vectis said it believed its vehicle ended up in the path of the dead woman’s car after a crash at a cross-road moments earlier.
General manager Richard Tyldsley said: “Early indications suggest a car pulled out in front of a route seven bus and our driver was unable to avoid it.
“The bus was forced into the path of another car.”
In a statement, Hampshire Constabulary said: “The cause of the collision is under investigation and we would not be able to give any further details.”
The woman, in her 60s, was travelling in a Fiat Bravo along with three other people.
Four people who were in a silver Mini Cooper were taken to hospital as a precaution.
Four air ambulances attended and airlifted four casualties to hospitals in Brighton and Southampton.
St Mary’s Hospital in Newport declared a major incident as it treated 15 patients.
The bus driver, a man in 50s, was seriously injured and 10 bus passengers were taken to hospital as a precaution, police said.
Five Isle of Wight fire crews were sent to the scene, removing three people from one car as well as freeing the bus driver from his cab.
The A3054 Forest Road was closed for about 11 hours near the crash scene at the Whitehouse Road junction.
Since the crash, more than 2,000 people have signed an online petition to install traffic lights at the “blind spot”.
One signatory wrote: “I am a driving instructor and hate bringing my pupils here as it scares me.”
Another said: “It has been known that it is lethal for years.”
Isle of Wight Council said: “Any decision by the council to implement road safety measures… would be only done following… a thorough investigation of the circumstances of what happened.”