Survivors of the detention camps during the Bosnian war have said that the recent discovery of a mass grave reminded them that it could have been them.
One survivor told ITV News: "The first feeling is that gosh, this could have been me, one of these bodies."
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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.