The condition of a six-year-old boy who was admitted to hospital with a girl aged five after they plunged into a river in Evesham in a car has stabilised.
Ryan and Gabrielle Grady were rescued from the River Avon in Evesham on Thursday and airlifted to Birmingham Children's Hospital.
A spokesman for the hospital said: "Ryan has improved today. His condition is critical but stable. Gabrielle is still critical and remains in intensive care."
The driver of the car, which "nose-dived" into the water at around 9.20am, was arrested on suspicion of attempted murder and remains in police custody.
A spokesman for West Mercia Police declined to comment on the relationship between the driver and the children.
Gabrielle spent almost two hours trapped in the submerged car before she was pulled free by police divers.
The vehicle, a silver Vauxhall Vectra estate, was winched from the water on Friday and taken for forensic investigation.
Detective Superintendent Steve Cullen said: "A prime concern of any investigation of this type is the welfare of the victims' relatives, close friends and colleagues at work or at school.
"Trained and dedicated family liaison officers are present at the hospital and at other locations to ensure that those closest to the victims receive all possible available support at this tragic time."