Police are monitoring 100 people protesting outside the Bullring in Birmingham.
People started gathering at around 3.00pm today, police say the motive for the protest is not yet known.
No crimes have been reported though police say say some shops and businesses have closed.
More to follow
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Staying mostly dry and quite a warm afternoon. Clear skies will develop into the evening.
Cloud will linger through the afternoon, but skies clearing later on.
Police and councils have welcomed a new law which bans the production, supply or possession of so-called 'legal highs'.