The granddaughter of a 83-year-old pensioner who was sexually assaulted in Paddington has made an emotional appeal for witnesses.
When the 83-year-old woman let the attacker into her Warwick Estate flat, believing he was an electrician, he told her to go into a bedroom before punching her, breaking her jaw, and assaulting her.
The ordeal ended when she managed to pull a panic alarm in the house, prompting a neighbour to go round.
Her granddaughter, who wishes to remain anonymous, said the attack had deeply shocked and saddened her whole family.
She added: "My grandmother is 83 and especially vulnerable. She was unable to defend herself against this brutal and exceptionally horrendous attack.
"She has been left severely traumatised, not to forget the serious physical injuries she sustained. I would ask that any person who can assist police in the identification of the attacker, or attackers, please contact the police immediately."
The pensioner identified the attacker as a black man, aged between 17 and 40.
Following developments in the case, Detective Inspector Simon Prankard, of Westminster's Rape Investigation Unit, said witnesses were urgently needed to come forward to help identify whoever is responsible for the attack - which took place between 3.30pm and 5pm on October 17.
He added: "This was a particularly vicious, sexually-motivated attack, on a vulnerable lady."
Anyone with information about the attack should call Westminster police on 020 7321 9434 or Crimestoppers anonymously on 0800 555 111.
A 17-year-old boy has been arrested in connection with the attack. He is currently on police bail pending further enquiries.