A 10-year-old boy was seriously hurt when he was bitten by a police dog in his back garden.
It happened in New Henry Street, Oldbury, while officers responded to reports of a nearby copper cable theft on Sunday.
A dog handler and his German Shepherd, Belgian Malinois cross were searching for four suspects when they entered a private garden and the boy was bitten.
The child remains in hospital where he continues to be treated, police said.
West Midlands Police said it would carry out its own investigation.