A two-month-old baby died in a Black Country car crash which also left a woman critically injured.
Police said the baby boy was taken to hospital from the scene of Saturday's collision in Grove Lane, Smethwick, but could not be saved.
West Midlands Police said a woman travelling in the same car - a Toyota Corolla - received multiple injuries and was in hospital in a critical condition.
Three other passengers in the vehicle, two men and a woman, received minor injuries.
Police said the occupants of the second car involved in the crash - a silver Mitsubishi Evolution - left the scene before officers arrived.
A spokeswoman said: "It is believed at this stage that there were at least four people travelling in the Mitsubishi. All left the scene following the collision prior to police attendance."
The cars collided near the junction of Grove Lane and Painters Corner at 6.11pm, police said.
A spokeswoman said the Mitsubishi had no registered owner.
Sgt Ferris Hatheson from the West Midlands Police collision investigation unit, said: "We are appealing for any of those in the Mitsubishi to come forward and speak to us as soon as possible or anyone who has any information in relation to their identity."
Anyone with information is urged to contact West Midlands Police on 0345 113 5000 or to call Crimestoppers on 0800 555 111.