Four people, including a one-year-old child, died after a car in South Yorkshire was hit by a car that was being pursued by the police.
The fatal accident involving a black VW Golf and a black VW Touran, in which two families were traveling, took place on Friday evening in Darnall in Sheffield.
The police tracked three men aged 23, 17 and 18 who were traveling in the Gulf. They were arrested and detained after minor injuries.
Two men aged 35 and 50, one of whom was a driver, and a 41-year-old woman, all traveling in the Touran and not being persecuted by the police, were declared dead at the scene. A one-year-old boy was declared dead in the hospital.
Three more passengers were injured. A 22-year-old woman is in critical condition, a second woman is also in a serious but stable condition while a three-year-old girl was hospitalized with life-threatening injuries.
South Yorkshire police asked for dashcam shots of the collision.
DCI Jew Ashmore said, "First and foremost, my thoughts are with the families of the victims who lost loved ones in this incredibly tragic incident.
"Last night, a large number of resources were allocated to the scene. Officers from all emergency services worked all night long into the morning to help.
"Our priority now is to support the families of the victims and those affected and to work hard to determine the exact circumstances of the events."
The Independent Office of Police Conduct has opened an investigation.
Miranda Biddle, Regional Director, said: "Once we were informed, we sent investigators to the scene and we will conduct an independent investigation to determine what action the South Yorkshire police took before the crash.
"This is a standard procedure when, after an incident involving the police, human lives are lost. Visiting the scene we were able to see dashcam footage confirming that although there was a persecution prior to the crash, there is no indication that the police vehicle is colliding with any of the vehicles involved.
"We also received initial statements from the officers involved and will gather more evidence as we investigate."
It is expected that the area near the crash will be closed most of Saturday.