Demonstrations began last week following the fatal shooting of 19-year-old black man Tony Terrell Robinson Jr. by a white police officer.

On Monday, the Wisconsin State Capitol became the focal point of the protests. There, a group of between 500 and 1,000 students who walked out of class at the University of Wisconsin-Madison rallied, surrounded by others who formed a safety perimeter.

Americans have again taken to the streets to protest against the fatal shooting of an unarmed African American teenager by a white police officer in Madison, Wisconsin.

On Friday night, 45-year-old Matt Kenny shot 19-year-old Tony Robinson who later surrendered to his injuries at hospital. Madison's police Chief Mike Koval acknowledged that the teenager was unarmed.

The protests over the deadly incident continued on Sunday for the third day in Madison, amid growing anger against the discrimination of minorities by white police officers.

University of Oklahoma students march to the now-closed Sigma Alpha Epsilon fraternity house during a rally against racism Tuesday.

Two former members of the fraternity have apologized for their roles in a video that showed them singing a racist chant. - npr.org.

Robinson's death was the latest in a string of police shootings across the country that have intensified concerns of racial bias in law enforcement.

Earlier, around 2,000 mostly teenaged students, including some from Sun Prairie High School, Robinson's alma mater, protested inside the rotunda of the Capitol amid a minimal police presence.

"There is an indifference between people and police. We all need to come together," said Ali Asafford, 15, after leaving class at Madison's East High School.

Marchers chanted "we want justice now," and "black lives matter" as they left the Capitol and marched down State Street, where they lay down in the street, holding signs upward as news helicopters flew overhead.

Officer Matt Kenny, the 12-year police veteran who shot Robinson, is on paid administrative leave while the Wisconsin Department of Justice investigates the shooting. Kenny was involved in fatal shooting in 2007, that was found justified.

Police Chief Michael Koval apologized on Monday after praying with Robinson's grandmother over the weekend and pledging transparency in the investigation of the shooting.

Attorney General Brad Schimel on Monday asked the public to be patient with the investigation, saying that his office would not be able to share details with the public since it could taint testimony from witnesses. (Additional reporting and writing by Fiona Ortiz in Chicago; Additional reporting by David Bailey in Minneapolis and Andy Sullivan in Washington, D.C.; Editing by Doina Chiacu, Alan Crosby and David Gregorio), - huffingtonpost.com.