This was a shocking attack by a man on a young woman, prompted by nothing more than a brief exchange of words.
It is vital we track down this man and hold him to account for his behaviour.
More top news
Newly released emails to a Muslim campaign group reveal Mohammed Emwazi felt "controlled" under the watch of the security services.
Tributes have been left in Caledonian Road in Islington where 15-year-old Alan Cartwright died after he was stabbed.
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