A brawl broke out late last week after a police chief dressed in street clothes tried to arrest a high school girl who allegedly was causing trouble amid a protest against Immigration and Customs Enforcement — and now some residents in the southeastern Pennsylvania borough of Quakertown want the chief to resign.

The Bucks County Courier Times said a probable cause affidavit provides the first official police account of what led to the arrest of five Quakertown High School students.

'Everybody was confused because nobody knew it was a policeman. He was in regular clothes. We were just like, "Why is the man attacking us?"'

At least 35 students participated in the Friday walkout to protest ICE, the Courier Times said, citing the affidavit.

Quakertown police had been monitoring the protest “from a safe distance” and assisting with road closures after students left the high school campus and headed into the downtown business district, the paper said.

More from the Courier Times:

Early in the protest Friday police allege they noticed a large group of protesters move into the road in the 100 block of East Broad Street, and a girl kicked a white pickup truck on the passenger side several times and hit the side mirror with her hand, the affidavit said.

Protesters also threw “ice balls” at vehicles, stood on public benches, and police approached the group and requested they protest respectfully, and keep the sidewalk clear, the affidavit said.

In a statement issued Friday, Quakertown police alleged student protesters threw snowballs at vehicles, kicked cars, and “damaged property such as tearing a side mirror from a car.”

The police statement also said that additional officers were called to the scene when confrontations with students escalated “and some individuals assaulted officers.”

However, the paper said witnesses and protesters alleged that motorists followed the students and revved their engines, blew exhaust fumes at them, and yelled taunts at the students.

The Courier Times, citing the affidavit, said students who continued walking toward Front Street were yelling obscenities “at the officers and in general."

RELATED: Praise rolls in for high school suspending hundreds of students over anti-ICE walkout: 'Adults are taking charge'

Police said a 15-year-old female protester was seen "numerous times" walking in the road, including in front of moving vehicles and blocking traffic, and she was warned to stay on the sidewalk, the paper reported.

An officer allegedly ordered the girl to come across the street to be detained, and when she started to walk away from him, the officer grabbed her arm, the Courier Times said, citing the affidavit.

With that, other teen protesters confronted the officer and pulled the girl away, which allowed her to slip into the crowd, the paper said, citing the affidavit.

The officer radioed for assistance, the affidavit said, after which Quakertown Police Chief Scott McElree, 72, and a sergeant arrived at the scene. The officer pointed to the girl he was trying to detain, and McElree allegedly attempted to arrest her — but a boy was pulling her away, the affidavit added.

More from the Courier Times:

After McElree grabbed the boy, he pulled away and struck the chief in the head with his cell phone multiple times, the affidavit said.

The boy was eventually taken to the ground and placed in custody after he intervened again attempting to keep McElree away from the 15-year-old girl, according to the document.

Multiple teens encircled McElree and began to punch and hit him including the 15-year-old girl that police were originally attempting to detain, the affidavit said.

The paper, citing the affidavit, added that a sergeant saw another teen boy dressed in black come up behind McElree and hit him three times on the right side of his face and rib area. With that, the sergeant grabbed the teen, took him down, and placed him in handcuffs, the Courier Times said.

RELATED: Juvenile hit by car at student anti-ICE protest in Florida

Another police officer saw a girl hit McElree in the head with her backpack while the chief was on the ground grappling with a female protester, the paper said, citing the affidavit.

What's more, a detective who responded to the scene allegedly saw a girl punch McElree in the head, after which the detective caught the girl and placed her on the sidewalk, where she allegedly kicked him several times while being handcuffed, the Courier Times said.

The girl whom police originally wanted to detain was taken into custody, the paper said, adding that her attorney, Ettore "Ed" Angelo, on Tuesday denied his client had any physical contact with McElree.

In all, five students were arrested and taken to juvenile detention.

Three of them were released Tuesday, the Courier Times said, adding that the status of the remaining two is unknown, and the Bucks County District Attorney's Office has released no information as of Tuesday. The DA's office on Thursday did not immediately respond to Blaze News' question regarding how many students have been released.

Authorities have not released their names, ages, and charges since they're juveniles, but the paper said it confirmed that at least two of the students face felony aggravated assault charges.

RELATED: Video shows brawl after high school walkout protester allegedly hit pro-ICE man — and the man is charged with child abuse

The Courier Times, citing the affidavit, said McElree was treated at a hospital for nonspecific injuries. The paper added that his face was covered in blood as he left the scene; however, in a cellphone video posted to social media he's heard telling an officer that he was "fine."

Since the melee, McElree has been facing increasing backlash, including calls for him to resign. One of the issues is that the chief was not in uniform and allegedly did not identify himself as a police officer, the Courier Times said.

Ashley Orellana, a Quakertown High School senior and friend of one of the arrested students, told WPVI-TV that "everybody was confused because nobody knew it was a policeman. He was in regular clothes. We were just like, 'Why is the man attacking us?'"

Orellana attended a hearing Tuesday to support one of the defendants, the station said, adding that Robert McMillion, who witnessed his younger sister's arrest, also was in attendance.

"The chief, the unmarked man, he just started attacking us first, and something should be happening to him instead of the kids," McMillion told WPVI.

At a borough council meeting Monday night, parents and community members called for McElree to resign or be fired, the station said.

RELATED: Girl says she fought 'old,' 'racist' man with MAGA hat at ICE protest — and excuses fellow teen brawlers

Meanwhile, the American Civil Liberties Union of Pennsylvania alleged that McElree violated his commitment to "serve and protect" his community amid the incident, WHYY-TV reported.

"By all accounts, including abundant video evidence, there were no issues at the demonstration until Quakertown police arrived and incited violence," Witold Walczak, legal director of the ACLU of Pennsylvania, told the station in a statement.

Walczak added to WHYY that "the police should have been there to facilitate the demonstration, ensuring that the students could safely exercise their rights to assemble and speak out freely as guaranteed by our Constitution. They failed. In abandoning his job and his mission on Friday afternoon, Chief McElree effectively was acting as a counter-protester, albeit one with the ability to arrest people. Quakertown deserves better."

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