Police are understood to be searching for chemical substances at a London property after two people were arrested under anti-terror laws. A 19-year-old man and 36-year-old woman were arrested in Streatham and Stratford.
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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.
Simon Lucy, 61, filmed hundreds of hours worth of footage on the London Underground network.