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15 December 2010, 19:07 | Updated: 15 December 2010, 19:10
Two police officers have been stabbed in broad daylight front of Christmas shoppers in Ealing.
It happened on Ealing Broadway around 3pm this afternoon.
A policeman's in a serious condition, a police community support officer's been injured but it's not thought to be life-threatening.
One man has been arrested.
Boris Johnson has said he's shocked by the stabbing and that there's no place for it on the streets of London.