Students from multiple Denver Public Schools walked out of class Friday afternoon to protest the election of Donald Trump.

Dozens of students were seen holding signs of Federal Boulevard. They stood on the side of the road in a line on the sidewalk.

DPS tweeted they were aware of the walkout and that district officials were working with police to monitor the students’ safety.

“We respect our students’ desire to express themselves, and schools are providing opportunities on campus for them to do so,” DPS tweeted. “We are encouraging students not to leave school, but to stay and participate in conversations with leaders at their campus.”

Parents with questions are asked to call the DPS Family and Community helpline at 720-423-3054.

There have been multiple protests in Denver since Trump was elected.

A large group of people gathered downtown Wednesday and Thursday night to protest the president-elect. Many carried signs and chanted anti-Trump slogans while marching down an impromptu route through the heart of the city.

Trump acknowledged the protests Thursday night, tweeting:

“Just had a very open and successful presidential election. Now professional protesters, incited by the media, are protesting. Unfair!”

A few hours later, he changed course.

“Love the fact that the small groups of protesters last night have passion for our great country,” he tweeted. “We will all come together and be proud!”