Hundreds of Portland protesters break in to federal courthouse and set it alight using fireworks as cops declare a riot for the second time in 72 hours and retreat into their precinct
A graffiti-covered federal courthouse in Portland was briefly set on fire Thursday night after a firework was thrown through a glass door broken by protesters
A group from the demonstration had broken into the Justice Center earlier
Cops declared a riot for the second time in three days after protesters refused to clear the area and threw rocks, bottles and fireworks at officers
An open pocket knife was thrown at one officer as smoke and pepper balls were used to disperse the crowd cops described as 'hostile and violent'
Attempts were made to set two separate statues on fire across the city and a third fire was set in the street
Several arrests were made but police could not confirm a number
Local black leaders have voiced concerns about the Black Lives Matter movement being co-opted by 'young white children' who are creating 'chaos'
A riot was also declared Tuesday as protesters gathered outside Portland Police Union headquarters

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