Amsterdam, Netherlands, 1st May 2015: Massed police sirens wailed in protest for seven minutes at the RAI convention centre, Amsterdam, midday today, as unions demand pay rises for the police who haven't had an increase in four years. The protest was timed to coincide with the annual May 1st labour day march, which saw 6000 people gather at the RAI. Police stations were also closed for two hours during the morning as part their ongoing protests. © Nick Gammon/Alamy Live News
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