Videos and photographs on social media showed the protesters, most wearing masks, with banners saying “Strike For Gaza” and “Liberated Zone” beneath the Lawrence A. Wein Reading Room’s chandeliers in the Butler Library.
Columbia’s public affairs office said in a statement that its public safety staff were asking protesters to show identification, and that if protesters do not comply with orders to disperse, they will be disciplined for breaking school rules and face “possible arrest.”
At one point, more people were seen trying to enter the library, according to a Reuters witness. Public safety staff locked a door and shoving and pushing ensued.
The protest comes as Columbia’s board of trustees continues its negotiations with US President Donald Trump’s administration, which announced in March it had cancelled hundreds of millions of dollars of grants to the university for scientific research.
New York City mayor Eric Adams said in an interview with the NBC 4 news channel that Columbia officials had asked for help and that the New York Police Department was sending officers to the campus.
Columbia University Apartheid Divest, a collection of student groups, recirculated on social media on Wednesday their long-standing demand that the university end investments of its US$14.8 billion endowment in weapons makers and other companies that support Israel’s military occupation of Palestinian territories.
Trump, a Republican, has called the pro-Palestinian student protests across college campuses last year antisemitic and anti-American. Student protesters at Columbia, Jewish organisers among them, say the government is unfairly conflating pro-Palestinian protests and antisemitism.
Trump is also trying to deport some pro-Palestinian international students at US schools, saying their presence could harm US foreign policy interests.
The protesters in the library also demanded the release of Mahmoud Khalil, a Palestinian activist and Columbia graduate student who remains in a Louisiana immigrants jail after he was among the first to be arrested.