A man was today being questioned by detectives following the death of a five-year-old boy.
Police were called after the ambulance service attended a house on Aberford Road, Wakefield, at 11.40am yesterday.
The boy was taken to nearby Pinderfields Hospital but he died later from his injuries, West Yorkshire Police said.
A 34-year-old man was arrested and is being questioned about the death.
A West Yorkshire Police spokeswoman said: "We were called by the ambulance service to a house on Aberford Road, in Wakefield, at 11.40am yesterday.
"Paramedics were treating a child there. A five-year-old boy was taken to Pinderfields Hospital, where he later died.
"Inquiries are ongoing into the full circumstances surrounding his death.
"A 34-year-old man has been arrested in connection with the death and is currently in police custody."
Tonight, the wooden gates leading to the driveway of the semi-detached house were closed.
A police officer could be seen standing behind the fence, in front of the property.
Lights were on inside the house and forensic officers could be seen working inside.
They occasionally left the house, which is on a busy main road near Pinderfields Hospital, carrying bags of evidence.