Tensions escalated for a third night in Wauwatosa, Wisconsin, as police used tear gas on demonstrators, who were protesting the fatal shooting of Alvin Cole by police.

"Law enforcement officers were struck with bottles, and deployed tear gas to stop the unlawful assembly," Wauwatosa police tweeted Friday, shortly after the 7 p.m. curfew went into effect.

Police reported Friday that demonstrators were removing dumpsters from businesses and moving them into the roadway.

Police and the National Guard are working to patrol Wauwatosa, and a curfew is in effect nightly from 7 p.m. to 6 a.m. until Monday.