The image with the Union Jack is from here:
Understanding the Roots of Anti-Immigration Protests in Britain
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Understanding the Roots of Anti-Immigration Protests in Britain
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The recent violent unrest that followed the tragic killing of three young girls, which was falsely attributed to a Muslim migrant, serves as a stark illustration of the dangerous consequences that can arise when false information is spread unchecked. Despite the police clarifying that the suspect was not a migrant, the damage had already been done. The misinformation had already fuelled widespread anger and provided a potent catalyst for existing anti-immigration sentiments to boil over into the streets."
In other words, a bunch of far-right nutjobs rioting based on the lies of right-wing media and talking heads.
The image with Polish flags seems to come from 2015 (that's the earliest version that appears on tineye.com) or before. That might be the Nationalist riots from 2014. Again, that was far-right nutjobs, smashing and burning things.
For the third straight year, the Polish holiday was marred by far-right protesters torching cars and fighting cops.
www.csmonitor.com