Five Taliban detainees being released in a deal that freed US Sergeant Bergdahl have left Guantanamo prison in US military aircraft en route to Qatar, a US Defense official said.
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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.
Engineering firm CH2M won the £170 million contract but have pulled out of phase two of the project over alleged conflicts of interest.