The impending crackdown at UCLA is the latest flashpoint for mounting tensions on US college campuses where protests over Israel's conduct of the war in Gaza have led to student clashes with each other, school administrators and law enforcement.
Starting at sunset on Wednesday, officers in tactical gear began filing onto the UCLA campus adjacent to a complex of tents occupied by throngs of demonstrators.
Some protesters were seen donning hard hats, goggles and respirator masks in anticipation of the raid a day after the university declared the encampment unlawful.
Police have told pro-Palestinian demonstrators at UCLA to clear out. (AP PHOTO)
Hundreds of other pro-Palestinian activists who assembled outside the tent city jeered police with shouts of "Shame on you", some banging on drums and waving Palestinian flags, as officers marched onto the campus grounds.
The demonstrators, many wearing the traditional Palestinian keffiyeh scarves, also chanted "Disclose, divest, we will not stop. We will not rest" and "Free free Palestine".
A much smaller group of demonstrators waving Israeli flags urged on the police to shut down the encampment, yelling, "Hey hey, ho-ho, the occupation has got to go."
But police officers stood by on the periphery of the tents for hours - presumably to let crowds of onlookers thin out - awaiting word from commanders to remove barricades and march into the encampment to arrest occupants who refused to leave.
Protesters donned hard hats, goggles and respirator masks in anticipation of the raid. (AP PHOTO)
Before moving in, police with a loudspeaker urged the demonstrators to clear the protest area in a grassy plaza between the landmark twin-tower auditorium Royce Hall and the main undergraduate library.
UCLA had cancelled classes for the day following a violent clash between the encampment's occupants and a group of masked counter-demonstrators who mounted a surprise assault late on Tuesday night on the tent city.
The occupants of the outdoor protest camp, set up last week, had remained otherwise peaceful before the melee, in which both sides traded blows and doused each other with pepper spray.
Members of the pro-Palestinian group said fireworks were thrown at them and they were beaten with bats and sticks. University officials blamed the disturbance on "instigators" and vowed an investigation.
Counter-protesters mounted a surprise assault on the UCLA camp's occupants on Tuesday. (AP PHOTO)
The confrontation went on for two or three hours before police restored order.
A spokesperson for California Governor Gavin Newsom later criticised the "limited and delayed campus law enforcement response" to the unrest as "unacceptable".
As the much-expanded police force entered the campus on Wednesday night to clear the encampment, some of the protesters were heard yelling at them, "Where were you yesterday?"
UCLA officials said the campus operations would resume on a limited basis on Thursday and Friday.
The UCLA encampment is one of many that have sprung up across US college campuses. (AP PHOTO)
Wednesday night's police operation came a day after police in New York City arrested pro-Palestinian activists who occupied a building at Columbia University and removed a tent city from the campus of the Ivy League school.
Police arrested a total of about 300 people at Columbia and City College of New York, Mayor Eric Adams said.
Many of those arrested were charged with trespassing and criminal mischief.
The clashes at UCLA and in New York were part of the biggest outpouring of US student activism since the anti-racism rallies and marches of 2020.
Earlier, New York police arrested activists who occupied a building at Columbia University. (EPA PHOTO)
Ninety pro-Palestinian demonstrators - students and outsiders - were arrested at Dartmouth University in New Hampshire on Wednesday, the Hanover Police Department said.
They were charged with criminal trespass and resisting arrest.
The protests follow the October 7 attack on southern Israel by Hamas militants from the Gaza Strip and the ensuing Israeli offensive on the Palestinian enclave.
Students have rallied or set up tent encampments at dozens of schools across the US in recent days, calling for an immediate ceasefire in Gaza and demanding schools divest from companies that support Israel's government.
Many of the schools have called in police to quell the protests.
