Four people held on suspicion of murder following the death of a taxi driver whose car hit a tree have been bailed.
The driver, in his 50s, is thought to have been involved in two altercations with occupants of another car before the crash in Telford, Shropshire.
Police say the first incident took place near a Tesco in Madeley and the second just afterwards by a school.
The taxi crashed in Madeley Road at 22:30 BST on Monday. Two men and two women were held and are now on bail.
A passenger in the taxi was injured and taken to the Queen Elizabeth Hospital in Birmingham.
The taxi driver was in a red Skoda Octavia while the other car involved was a silver Peugeot 307.
Det Ch Insp Stephen Tonks, from West Mercia Police, asked anyone with any information about both cars travelling along Park Avenue, Park Street, Ironbridge Road and then Madeley Road, to contact police or Crimestoppers anonymously.
The two arrested women are aged 37 and 18 and two men 31 and 18.
Graham Hoof, operations director at Go Carz where the taxi driver worked, said: "We can confirm that the incident in Madeley involved one of our drivers who sadly passed away.
"We are assisting the police with their investigations and our thoughts are very much with the driver's family and the passenger who was injured."