A 94-year-old woman is in hospital after she was attacked as she slept in her own bed.
Emma Winnall suffered multiple injuries including a fractured skull, a broken arm and wrist and a partially severed finger in the attack, which is believed to have taken place in her home in Pensby Close in Moseley, Birmingham, overnight on Monday.
The pensioner remains seriously ill and sedated in hospital having undergone emergency surgery, including having metal plates inserted into her arm, West Midlands Police said.
She is showing signs of improvement and it is hoped she will make a full recovery, the force said.
Detectives investigating the incident have so far been unable to determine a motive for the attack and are urging Birmingham's communities for help to trace the person who sneaked into her home and carried out the attack.
West Midlands Police Detective Chief Inspector Sarb Johal said: "It doesn't appear anything was stolen from the lady's home and the interior was largely undisturbed."
He added: "She suffered very nasty injuries and ones which, given her age, could well have been life-threatening. She is showing signs of improvement in hospital; our thoughts are with her and hopefully she will make a full recovery."
The victim's carer raised the alarm at 9am on Tuesday morning but the attack could have occurred at any time from 9pm the previous night.
Mr Johal added: "This is a truly sickening attack on a defenceless, frail lady as she slept in her own home. Mrs Winnall had nothing of note to steal ... it was a senseless assault and I'd urge anyone with suspicions about who may be responsible to get in touch straight away."
Anyone with information is asked to contact West Midlands Police on 101 or Crimestoppers on 0800 555111.