A 70-year-old woman has been sectioned after attacking a young girl in Feltham.
The 11-year-old victim was slashed in the head and hand on Thursday after the elderly woman approached her at around 3.40pm in Hatton Road asking for the time.
The woman was arrested and sectioned under the Mental Health Act and both were taken to west London hospitals. The blade was found at the scene.
DS Aine Collins from Hounslow CID said:"We are appealing for witnesses who may have seen this incident.
"Hatton Road is a busy street and at this time of day there would have been many people
in the area, including people collecting their children from the local school. I would urge anyone to come forward with any information, no matter how small it may seem, to help us with this investigation."
Anyone with information should call Hounslow CID on 020 8247 6160 or Crimestoppers anonymously on 0800 555 111.