An immigration protest turned violent Friday in downtown Los Angeles, with a teenager stabbed and at least one person taken into custody. Another protest in Pasadena was peaceful.

The downtown protest, largely involving high school students, began Friday morning, with various groups ultimately converging on Los Angeles City Hall, then marching through streets in the area and later gathering in Grand Park.

Around 1:30 p.m., some type of scuffle broke out among an unknown number of people, and one person — likely a student — wound up on the ground, bleeding from an apparent stab wound, according to video from the scene. Many other students then ran from the park as police and paramedics arrived.

A 17-year-old boy was loaded into an ambulance and taken to a hospital, LAPD said. The victim was in critical condition, according to Los Angeles police officer Drake Madison.

A witness told KTLA Channel 5 that the assailant who stabbed the victim was an outsider who was not involved in the protest.

Initial reports from the scene indicated that a person had been detained. Police had no update available regarding an arrest, but several people were detained at the scene, Madison said.

Los Angeles police declared the remaining protesters to be involved in an unlawful assembly and ordered the group to disperse, which they ultimately did. While the participants walked in various directions away from the park, a group later assembled on the Sixth Street Bridge.

Spring Street was closed in front of City Hall and Grand Park while a police investigation was conducted, but eventually reopened from Temple Street to First Street, the LAPD Central Division reported on X.

The protest by students against President Donald Trump’s immigration policies marked the sixth straight day of such rallies in the downtown area.

The marches had been mostly peaceful, although dozens of people were detained when a downtown protest got unruly on Monday night.

In the Pasadena Unified School District, hundreds of students walked out of campus on Friday, marching to Pasadena City Hall, where they held up signs and flags and chanted.

Amid honks from passing cars, they voiced concerns about the fate of their peers and their parents under immigration sweeps.

By 1 p.m., a larger group of Blair High School students had gathered on the steps of Pasadena City Hall.

Other schools were set to join them as they organized through social media.

“I think it’s important that we all just support our community,” said one student who comes from an immigrant background and has a friend at school from El Salvador. Other students also said many of their peers had concerns, if not about their own families, about whether their friends might be deported.

“My friend, she’s from El Salvador — she came here, and she’s, like, worried she’s gonna go back. And I don’t want her to go back,” the student said.

The students were accompanied by a group of school site administrators who said they were looking out for their safety as they marched through city streets.

Another student said, “We need freedom. Immigrants built this country.”

District officials had sent a message to students and families on Thursday in anticipation of the walkouts.

“The safety of our students and staff is our top priority,” it read. “While we respect our students’ First Amendment rights and these important conversations, we must balance this with the safety of our schools and ensure we limit disruptions to the learning process. Our schools make classroom dialogues and campus activities available to provide secure forums where all opinions are respected in both words and actions.”

Sierra van der Brug, Ryan Carter and City News Service contributed to this report.