Anna Zamejc, a freelance journalist, who lives near the scene of an explosion in the old city of the Czech capital Prague, reports that witnesses have said that flats at the explosion site were "totally destroyed".
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An "erratic" driver sparked a security alert after ploughing into a police car near the US Congress and nearly mowing down several officers.
Thousands of people have linked hands on Westminster Bridge in a show of solidarity - one week after the terror attack in the capital.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.