Police raid on Columbia campus 

Dozens of helmeted police raid Columbia University's campus in the heart of New York City on Tuesday.

They also arrested students protesting against Israel’s war on Gaza in a raid on New York’s Columbia University, while a Palestinian solidarity encampment at the UCLA campus in Los Angeles has been attacked.

Police climbed into Hamilton Hall via a second floor window they reached from a laddered truck, before leading handcuffed students out of the building into police vans.

The hall had been occupied at dawn by demonstrators who vowed they would fight any eviction, as they protested the soaring death toll from Israel's war with Hamas in the Gaza Strip.

The action came as university administrators around the United States have struggled for weeks to contain pro-Palestinian demonstrations on dozens of campuses.