SAN FRANCISCO — Video surfaced online Saturday showing an officer at a California university calmly pepper-spraying a line of several sitting protesters, who flinch and cover their faces but remain passive with their arms interlocked as onlookers shriek and scream out for the officer to stop.
The chancellor of the University of California, Davis described the video images as "chilling" and said she was forming a task force to investigate even as a faculty group called for her resignation because of the incident Friday.
"The use of the pepper spray as shown on the video is chilling to us all and raises many questions about how best to handle situations like this," Chancellor Linda Katehi said in a message posted on the school's web site on Saturday.
The protest was held in support of the overall Occupy Wall Street movement and in solidarity with protesters at the University of California, Berkeley, who were jabbed by police with batons on Nov. 9.
The UC Davis video images, which were circulated on YouTube and widely online, prompted immediate outrage among faculty and students, with the Davis Faculty Association saying in a letter Saturday that Katehi should resign.
"The Chancellor's role is to enable open and free inquiry, not to suppress it," the faculty association said in its letter.
It called Katehi's authorization of police force a "gross failure of leadership."
Katehi was expected to speak at a news conference later Saturday.
Images of police evictions have served to galvanize support during the Occupy Wall Street movement, from the clash between protesters and police in Oakland last month that left an Iraq War veteran with serious injuries to more recent skirmishes in New York City, San Diego, Denver and Portland, Ore.
The forcible Oakland protest eviction, the first of its kind on a large scale, marred the national reputation of the city's mayor and police department while rallying encampments nationwide beset with their own public safety and sanitation issues.
Police chiefs and mayors held conference calls to discuss containment strategies in the days after the Oct. 25 Oakland eviction. The use of rubber bullets and tear gas dropped off, though police departments have turned to pepper spray when trying to quell large crowds.
Some of the most notorious instances went viral online, including the use of pepper spray on an 84-year-old activist in Seattle and a group of women in New York. Seattle's mayor apologized to the activist, and the New York Police Department official shown using pepper spray on the group of women lost 10 vacation days after an internal review.
In the video of UC Davis protest, the officer, a member of the UC Davis police force, displays a bottle before spraying its contents on the seated protesters in a sweeping motion while walking back and forth. Most of the protesters have their heads down, but at least one is hit in the face.
Some members of a crowd gathered at the scene scream and cry out. The crowd then chants, "Shame on You," as the protesters on the ground are led away. The officers retreat minutes later with helmets on and batons drawn.
Ten people were arrested.
University spokeswoman Karen Nikos said nine people hit by pepper spray were treated at the scene. Another two were taken to hospitals and later released.
Nikos declined to release the identity of the officer in the video.
UC Davis Police Chief Annette Spicuzza told the Sacramento Bee (http://bit.ly/sKoP5T ) that police used the pepper spray after they were surrounded. Protesters were warned repeatedly beforehand that force would be used if they didn't move, she said.
"There was no way out of that circle," Spicuzza said. "They were cutting the officers off from their support. It's a very volatile situation."
Many Twitter and Facebook comments supported the students and criticized the response.
"Stomach churning video of police using pepper spray on seated anti-Wall Street protesters in Davis, Calif.," actress and model Mia Farrow wrote in a retweet of the video.
Associated Press reporters Nigel Duara in Portland, Ore., and Meghan Barr in New York City contributed.