Archaeologists have been left baffled by the discovery of walrus bones in a coffin under St Pancras Station.
They were found during excavations at the station, before it was refurbished to become the new Eurostar terminal.
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PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Those gathered on the bridge fell silent at 2.40pm - the time the first call was made to police exactly seven days ago.