The New York Police Department entered the Columbia University campus late Tuesday evening after receiving a letter from the university authorizing them to go into the campus, a law enforcement source familiar with the situation told CNN.
Officers entered Hamilton Hall, which had been occupied by protesters since the early morning hours Tuesday.
Dozens of people have been arrested.
NYPD officers use a special vehicle to enter Columbia University’s Hamilton Hall, which has been occupied by student protesters in New York on Tuesday.
Police detain a protester.
A NYPD bus transports people detained at Columbia University.
Police stand guard on campus at Columbia University.
Protesters walk with barricades as police maintain a cordon around campus.
NYPD officers in riot gear march onto the Columbia University campus.
