Black Lives Matter protesters in Portland, US were once again met with tear gas from federal officers on the 11th night of violence in the city.

Crowds breached the fence of the Mark O. Hatfield US Courthouse last night and federal agents fought back after they declared the gathering a riot in the early hours of the morning.

Earlier in the day thousands turned out by the courthouse to protest against social injustice in the country and president Donald Trump’s order to dispatch federal agents to handle the demonstrations.

Meanwhile thousands more gathered in Alberta Park in Northeast Portland.

The courthouse, which has been a target for protesters as demonstrations became more violent recently, was surrounded by around 1,000 people by 10pm and many began to shake the reinforced fence which surrounds it.

The Federal Protective Services then made an announcement to stop tampering with the fence which in turn led to an increased effort to take it down.

Federal officers then began to line up with tear gas canisters while protesters yelled at them to go home and pleaded with them for their right to protest.

Chants then broke out of Black Lives Matter and Feds go home.

At 12.30am officers made another announcement: "This is the Federal Protective Service. If you continue to cut through our fence, you’re subject to arrest and chemical munitions.”

Despite the warning from federal agents, protesters continued with their assault of the fence and breached it at around 1am as they set off fireworks. 

Tear gas was then deployed on protesters.

It was the end to a day of chaos as a man was arrested after another man was stabbed. 

43 year-old Blake D. Hampe was taken in by police on suspicion of second-degree assault though officers did not release any details on what led to the incident.

The latest violence in the city has seen a call for peace from the police.

Portland Police Chief Chuck Lovell released a video applauding police and asking people to stop engaging in violent protests

And E.D. Mondainé, president of the Portland branch of the NAACP, wrote in the Washingotn Post last week: "As the demonstrations continue every night in Portland, many people with their own agendas are co-opting, and distracting attention from, what should be our central concern: the Black Lives Matter movement.”

Protests began in the city following the death of George Floyd in May. There have been continual peaceful protests for the 60 days since with demonstrations becoming more violent over the past week.