Police are appealing for help finding a 75-year-old pensioner who has gone missing from her home in Hornsey.
Frances Madigan left home in Carysfort Road, N8, to go shopping at about 2:00pm on Friday 15th February.
Officers are becoming increasingly concerned for her welfare as Mrs Madigan has dementia and requires medication.
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Passengers looked horrified as the girl took the potentially lethal shortcut between platforms.
Police were called to Kilburn High Road at 5.20pm after reports of a shooting.
In just 24 hours the offer was retweeted more than a thousand times on Twitter.