NEW YORK — On Tuesday, two arrests were made as pro-Palestinian protesters demonstrated outside Columbia University, just as students returned to class for the fall semester.

The NYPD put up barricades and anyone entering the campus was subject to an identification screening.

A university spokesperson released the following statement:

“The university welcomed new and returning students for a productive first day of classes on Morningside Campus. As we begin the new semester, we are focused on our mission of teaching, creating and advancing knowledge and ensuring a safe, respectful campus environment for our community.”

As classes resumed Tuesday, students and faculty were already planning for a resumption of the protests that convulsed the Manhattan campus at the tail end of the spring semester and touched off a wave of college demonstrations nationwide.

In recent weeks, the university’s new leadership has embarked on listening sessions aimed at cooling tensions, released a report on campus anti-Semitism and circulated new protest guidelines meant to limit disruption. But student organizers were undeterred, promising to ramp up their actions — including possible encampments — until the university agrees to cut ties with companies linked to Israel.

“As long as Columbia continues to invest and to benefit from Israeli apartheid, the students will continue to resist,” said Mahmoud Khalil, a graduate student who represented campus protesters in negotiations with the university. “Not only protests and encampments, the limit is the sky.”

The start to the school year comes less than a month after the resignation of Columbia’s president, Minouche Shafik, who brought police onto campus twice last spring to clear out protest encampments. When a small group of students occupied a university building, hundreds of police officers surged onto campus, making arrests and plunging the university into lockdown.

Since Shafik’s resignation, the interim president, Katrina Armstrong, has met with students on both sides of the issue, promising to balance students’ rights to free expression and a safe learning environment. While the message has inspired cautious optimism among some faculty, others see the prospect of major disruptions as all but inevitable.

“We are hoping for the best, but we are all wagering how long before we go into total lockdown again,” said Rebecca Korbin, a history professor who served on Columbia’s anti-Semitism task force. “There haven’t been any monumental changes, so I don’t know why the experience in the fall would look much different than what it did in the spring.”

In a report released Friday, the task force, made up of Columbia faculty, accused the university of allowing “pervasive” anti-Semitism to fester on campus following the Oct. 7 Hamas attack. The report recommended that the university revamp its disciplinary process and require additional sensitivity training for students and staff.

Demonstrations against the war have already started bubbling up on college campuses this semester, including one at the University of Michigan resulting in multiple arrests. While the handful of recent protests near Columbia have been minor, signs of last spring’s tumult are apparent.

The university’s tall iron gates, long open to the public, are now guarded, requiring students to present identification to enter campus. Inside, private security guards stand on the edge of the grassy lawns that students had seized for their encampment. A new plaque on a nearby fence notes that “camping” is prohibited.

Layla Hussein, a junior at Columbia who helped to lead orientation programming, described the added security measures as an unwelcome and hostile distraction.

“We’re trying to cultivate a welcoming environment,” Hussein said. “It doesn’t help when you look outside and it’s a bunch of security guards and barricades.”

Others have accused the university of treating the student protesters too leniently, arguing that a lack of clear guidelines would result in further turmoil this semester. Though some of those disciplinary cases remain ongoing, prosecutors have dropped charges against many of the students arrested last semester and the university has allowed them to return to campus.

“They violated every rule in the book and they openly state they’ll continue to do so,” said Elisha Baker, a junior at Columbia who leads an Israeli engagement group. “We need to have a serious reckoning with the disciplinary process to make sure students have a safe learning environment.”

A spokesperson for Columbia said the university had since bolstered its guidelines around protests and developed new training for incoming students on anti-Semitism and Islamophobia.

The revised protest regulations require organizers to inform the university of any scheduled protests, barring demonstrations that “substantially inhibit the primary purposes of a given university space.”

“The university may restrict expression that constitutes a genuine threat of harassment, that unjustifiably invades an individual’s privacy or that defames a specific individual,” the guidelines note.

Like many universities, Columbia is also in the midst of a contentious debate about the definition of anti-Semitism and whether anti-Zionist speech — common at the student protests — should be seen as a form of discrimination.

– ABC Channel 7 NY WABC-TV report. Edited for style.