David Cameron's pledge to press for a "proper, independent investigation" into reports that three men were tortured while in police custody in Dubai.
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British police have closed some traffic outside the road leading to 10 Downing Street.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.
The Old Bailey heard how Syed tried to get weapons online, including a bomb vest, and trawled the web to find a busy area launch an attack.