There also was a scene of smoke, with demonstrators shooting off fire extinguishers at the approaching officers.
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UCLA officials said all campus operations will be limited today and Friday.
PREVIOUSLY:An unlawful assembly order has been given by law enforcement to a pro-Palestinian encampment at UCLA.
Police at one of the buildings on the UCLA campus.Jason Armond / Los Angeles Times via Getty Images
The order sets the stage for a confrontation between entrenched protesters and officials if the encampment does not disperse.
The order today came after a violent attack on the encampment last night at UCLA.
Police are marshalling forces around UCLA and have issued several orders to reset the area or face arrest.
Police officers clash with pro-Palestinian protesters as a fire extinguisher is deployed at UCLA early Thursday morning.Wally Skalij/Los Angeles Times via Getty Images
Police have been seen in riot gear.
The encampment has issued a call to the public to join them.
Student supporters lined up arm in arm in an effort to prevent law enforcement from reaching the encampment.
On Tuesday, UCLA saw a violent confrontation between pro-Israel counter-protesters and the pro-Palestinian encampment.
The counter-protesters used fireworks on the encampment and brawls broke out.
There were only a few UCLA police present and were overwhelmed.
Last week, police cleared an encampment at USC, arresting 90 people.
However, the encampment returned over the weekend, and a tactical alert was issued by police.
However, the encampment ended its occupation without incident and the alert was called off.
Colossal law enforcement presence gathering behind the Federal Building off Wilshire and the 405.
CHP, LAPD, and LASD.
