Nearly 200 protesters were arrested on Saturday at Northeastern University, Arizona State University, Indiana University and Washington University in St. Louis, according to officials, as colleges across the country struggle to quell growing pro-Palestinian demonstrations and encampments on campus.

More than 700 protesters have been arrested on U.S. campuses since April 18, when Columbia University had the New York Police Department clear a protest encampment there. In several cases, most of those who were arrested have been released.

At Washington University in St. Louis, the campus was locked down amid protests and several arrests were made on Saturday evening, according to the campus police and updates on the university website. Jill Stein, the Green Party candidate for the 2024 presidential election, was among the arrested, along with her campaign manager and another staff member, a spokesman for the campaign said. It was not immediately clear how many people were arrested.

Earlier in the day, at Northeastern in Boston, protesters had set up an encampment on the campus’s Centennial Common this week that drew more than 100 supporters. The administration had asked the protesters to leave, but many students did not.