Hamburg police said some of the protesters began hurling objects at the 2,000 officers after the demonstration began.
"The protesters suddenly started marching, and this was not what we agreed on with them, so we had to stop the march. Then bottles, stones and fireworks were thrown at us, injuring several officers. We had no option but to deploy water cannons." said Hamburg police spokesperson.
Prior to the demonstration, police had declared parts of the inner city a ‘danger zone,’ giving law enforcement extended rights to search and detain people without initial suspicion.
Aljazeera
MNA
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