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A man has been arrested after a police officer was assaulted during an immigration protest in Glasgow city centre on Saturday afternoon .
Crowds gathered in Buchanan Street on September 20, with hundreds of people turning out for demonstrations supporting and opposing immigration .
A gathering was arranged by controversial podcaster John Watt who called for a 'unity rally' on the steps outside the Buchanan Galleries shopping centre.
However, Watt's supporters were met with backlash as anti-racism groups turned up.
The two sides were separated by a blockade of police officers and metal railings. The group Stand Up to Racism claimed their numbers in attendance exceeded those attending the 'unity rally'.
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However, Police Scotland ha