A Jewish professor has accused staff at Colombia university of being “scared” to stand up to pro-Palestinian protesters after he was denied entry to the school’s campus over safety concerns.

It comes as dozens of people were arrested at Yale and New York universities on Monday, as demonstrations over the war in Gaza continued to roil colleges across the US.

In Colombia, pro-Palestine protesters have erected dozens of tents on the university's main lawn, demanding that the university supports a ceasefire in Gaza and divests from Israel funds.

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