(Portland, OR) -- The Portland Police Bureau says officers used tear gas on protesters gathered in North Portland last night despite a judge's order for police to stop using the crowd-control method. The bureau says officers deployed CS gas near North Lombard and Albina Avenue after declaring the gathering a riot and ordering people to leave. Protesters had initially gathered at the Portland Police Association building before moving to Lombard and Albina, where they chanted "Black Lives Matter" while holding their hands up. A judge recently ordered the police bureau to stop using tear gas against protesters except in cases of life-threatening situations. It's not immediately clear exactly what prompted officers to use tear gas, but police claim there was "criminal activity" occurring.