PHILADELPHIA (AP) — Pro-Palestinian protesters set up a new encampment at Drexel University in Philadelphia over the weekend, prompting a lockdown of school buildings, a day after authorities thwarted an attempted occupation of a school building at the neighboring University of Pennsylvania campus.

After several hundred demonstrators marched from Philadelphia’s City Hall to west Philadelphia on Saturday afternoon, Drexel said in a statement that about 75 protesters began to set up an encampment on the Korman Quad on the campus. About a dozen tents remained Sunday, blocked off by barricades and monitored by police officers. No arrests were reported.

Drexel President John Fry said in a message Saturday night that the encampment “raises understandable concerns about ensuring everyone’s safety,” citing what he called “many well-documented instances of hateful speech and intimidating behavior at other campus demonstrations.” University buildings were on lockdown and were “open only to those with clearance from Drexel’s Public Safety,” he said.

Drexel authorities were “closely monitoring” the demonstration to ensure that it was peaceful and didn’t disrupt normal operations, and that “participants and passersby will behave respectfully toward one another,” Fry said.

“We will be prepared to respond quickly to any disruptive or threatening behavior by anyone,” Fry said, vowing not to tolerate property destruction, “harassment or intimidation” of students or staff or threatening behavior of any kind, including “explicitly racist, antisemitic, or Islamophobic” speech. Anyone not part of the Drexel community would not be allowed “to trespass into our buildings and student residences,” he said.

On Friday night, members of Penn Students Against the Occupation of Palestine had announced an action at the University of Pennsylvania’s Fisher-Bennett Hall, urging supporters to bring “flags, pots, pans, noise-makers, megaphones” and other items.

The university said campus police, supported by city police, removed the demonstrators Friday night, arresting 19 people, including six University of Pennsylvania students. The university’s division of public safety said officials found “lock-picking tools and homemade metal shields,” and exit doors secured with zip ties and barbed wire, windows covered with newspaper and cardboard and entrances blocked.

Authorities said seven people arrested would face felony charges, including one accused of having assaulted an officer, while a dozen were issued citations for failing to disperse and follow police commands.

The attempted occupation of the building came a week after city and campus police broke up a two-week encampment on the campus, arresting 33 people, nine of whom were students and two dozen of whom had “no Penn affiliation,” according to university officials.

Dozens of George Washington University graduates walked out of commencement ceremonies, disrupting university President Ellen Granberg’s speech, in protest over the ongoing siege of Gaza and last week’s clearing of an on-campus protest encampment that involved police use of pepper spray and dozens of arrests.

The ceremony, at the base of the Washington Monument, started peacefully with fewer than 100 protestors demonstrating across the street in front of the Museum of African American History and Culture. But as Granberg began speaking, at least 70 students among the graduates started chanting and raising signs and Palestinian flags. The students then noisily walked out as Granberg spoke, crossing the street to a rapturous response from the protesters.

Students and others have set up tent encampments on campuses around the country to protest the Israel-Hamas war , pressing colleges to cut financial ties with Israel. Tensions over the war have been high on campuses since the fall but demonstrations spread quickly following an April 18 police crackdown on an encampment at Columbia University.

Nearly 3,000 people have been arrested on U.S. campuses over the past month. As summer break approaches, there have been fewer new arrests and campuses have been calmer. Still, colleges have been vigilant for disruptions to commencement ceremonies.

President Joe Biden told the graduating class at Morehouse College on Sunday, which included some students wearing keffiyeh scarves around their shoulders on top of their black graduation robes, that he heard their voices of protest and scenes from the conflict in Gaza have been heartbreaking. He said given what he called a “humanitarian crisis” there, he had called for “an immediate cease-fire” and return of hostages taken when Hamas attacked Israel on Oct. 7.

The latest Israel-Hamas war began when Hamas and other militants stormed into southern Israel on Oct. 7, killing around 1,200 people and taking an additional 250 hostage. Palestinian militants still hold about 100 captives, and Israel’s military has killed more than 35,000 people in Gaza, according to Gaza’s Health Ministry, which doesn’t distinguish between civilians and combatants.