A man has died and a woman has been seriously injured after they were hit by a "runaway" car which rolled down a hill.
Police were called to Finsbury Terrace in Swansea at around 9.20am on Sunday amid reports of two people being injured.
A force spokesman said: "Initial reports are that a vehicle has rolled down the street trapping a male and female underneath the vehicle.
"The female has been conveyed to hospital by air ambulance.
"The male sustained fatal injuries."
Emergency services are still at the scene dealing with the incident.
A spokeswoman for Mid and West Wales Fire and Rescue Service added: "There are two crews there and an officer. They had to release people from underneath a vehicle at 9.21am. We released two casualties from underneath the vehicle.
"There was a helimed there and a rapid response vehicle."
The Brynmill area, where the tragic accident occurred, is home to many students in Swansea.
Local councillor Peter May said he was shocked to hear of the incident.
He said: "Looking at the scene, it appears that the vehicle must have run down a hill from a back lane just off Brynmill Crescent.
"The people in the street are naturally very shocked at what has happened.
"There is a lot of uncertainty as to whether it was someone known to us."