They are calling it "the site we've been dreaming of for 20 years". 10,000 artefacts, many of them in incredible condition, have been dug up on a three-acre site in the City. And according to experts, it could transform our understanding of Roman London as Liz Wickham reports.
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Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.