Three men have now been bailed by police in connection with a hit-and-run crash which left a two-year-old boy and his 10-year-old sister fighting for their lives.
Raham Saleem and his sister Sabam were knocked down by a Vauxhall Astra in Brudenell Road, Hyde Park, Leeds, on Saturday.
A 36-year old-man was arrested on suspicion of dangerous driving and failing to stop and failing to report a collision. A 39-year-old man was arrested on suspicion of dangerous driving.
A 26-year-old man was arrested on suspicion of assisting an offender.
Police have also recovered a vehicle in connection with the investigation.
Raham and Sabam were hit at around 5.20pm on Saturday after buying onions for the family's Eid celebrations. A cousin, who was with the children, escaped injury. Officers said the driver slowed down to see what had happened, then sped away from the scene.
The children underwent surgery at Leeds General Infirmary where Sabam remains in a critical condition. But West Yorkshire Police said her brother was now improving and has been moved out of the intensive care unit.
Police earlier released an image of the silver or grey Vauxhall Astra mark 4 believed to have been involved in the collision. Detectives also said they believed a woman seen on the street at the time may have witnessed what happened and urged her to contact them.