A man has been arrested on suspicion of attempted murder after an 11-year-old girl was stabbed and left with serious injuries.
Officers were called just after 1am on Friday after neighbours said they heard a disturbance, West Midlands Police said.
The girl was found at the address on Kent Road in Wolverhampton with multiple injuries, including one to the head, and remains critically ill in hospital.
A 51-year-old man was arrested at the scene and is receiving treatment for a cut hand.
Police said they were not looking for anyone else in connection with the stabbing.
A woman in her 80s also suffered a dislocated shoulder during the incident and was being treated in hospital.
The house has been cordoned off to allow forensic experts to conduct an examination, police said.
Superintendent Harvi Khatkar, of Wolverhampton Police, said: “This is an extremely distressing incident and we are working to establish exactly what has happened.
“We fully understand the impact that this will have on the community.
“But we do believe this is an isolated incident, and we are not looking for anyone else.
“Extra officers will be out patrolling the area to offer reassurance to residents.”
A woman who lives over the road from the house where the incident is believed to have happened said an injured elderly woman banged on her front door at about 1am seeking help.
The neighbour, who asked not be named, said: “My son answered the door. The woman was wearing a dressing gown and said the little girl had been attacked.
“We haven’t heard any more about how the lady is. I don’t know her first name – she asked for help and she was very upset.”
Another neighbour said: “All we know is what the police have said. I had seen a girl go in and out of the house and she was always smiling.
“It’s just a terrible thing to happen.”