Pro-Palestinian protesters assaulted an employee in a forced takeover of Milbank Hall at Barnard College late Wednesday as administrators warned additional steps may be needed to end the protest,

A group of masked demonstrators forcibly entered Milbank Hall and physically assaulted two employees, sending one to the hospital, according to reports, which noted some classes were canceled and walls were vandalized as the demonstrators issued demands.

Barnard College officials say pro-Palestinian protesters wearing kaffiyeh scarves and masks pushed their way into Milbank Hall, which houses the offices of the dean, and assaulted a school employee.

A pro-Palestinian sit-in at Barnard College turned violent, prompting the Columbia affiliate to lock down campus.

It was the second time the Transport Workers Union called out Columbia University and its affiliates for not doing enough to keep its members safe.

The demonstrators, who were protesting the expulsions of two students, assaulted a campus employee, sending the worker to the hospital, a Barnard College spokeswoman said.