A car drove into a crowd in England.
A 19-year-old and a 16-year-old girl were killed, the police said on Monday.
A man and a woman between the ages of 20 and 30 were critically injured.
A 54-year-old man was arrested on suspicion of dangerous driving resulting in death, it said.
The police called on eyewitnesses not to share photos and videos of the incident in the central English city of Oldbury late Sunday evening on social networks, but to make them available to investigators.
At the time, many people were gathered at the scene of the accident.
The police initially did not provide any further information about what happened.