Forensics officers have set up a tent at the scene of a fatal stabbing in Fulham.
A 65-year-old man was pronounced dead at the scene yesterday evening.
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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.