As the academic year comes to a close, tensions continue to rise at pro-Palestinian student encampments at college campuses nationwide. Some universities are increasing security measures, including deploying police to remove demonstrators.

Since April 18, when at least 108 protesters were arrested at Columbia University, there have been over 800 arrests at nearly two dozen campuses. Arrests have continued into Tuesday.

On Monday night, protesters at Columbia took over Hamilton Hall. After the demonstrators took over the building, administrators closed the campus to everyone but students living in the dormitories and essential staff members. On the West Coast, at California State Polytechnic University, Humboldt, protesters were barricaded inside Siemens Hall for more than a week.

Here are the latest photos and video from the protests.

Columbia University