RELATED: Bay Area students walk out in protest of Trump presidency
It happened when students from Pittsburg High walked out last Thursday.
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"One of our officers actually witnessed the school Principal (Todd) Whitmire actively involved in the protest," said Chief Allan Cantando of the Antioch Police department.
When asked if he participated, the principal said he did not.
Cantando says it's one thing to have hundreds of students marching, it's another when it appears a school principal is right there with them and, in Cantando's view, crossing the line.
"He was mouthing the words they were saying, expletives toward President-elect Trump, and fist-pumping," said Cantando.
Principal Whitmire told us he was there when a couple hundred of his students turned a lunchtime rally into a walkout last Thursday, but only to keep them safe.
"If I'm expecting them to act a certain way, then I certainly need to act that way as well," Whitmire said. "So absolutely not, the use of profanity, of any type of language or any type of motions that would encourage them."
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The students marched four miles from Pittsburg to Antioch High.
Along the way, a window was shattered at a Subway restaurant. Garbage cans were turned over and one student allegedly threw an orange at an Antioch police officer.
"I believe the actions of this principal could be constructed as he condoned the behavior he condoned the truancy," said Cantando.
"From everything I've looked at, I really support the principal and all the staff's actions that they did to really step in and mitigate that situation," said Janet Schulze of Pittsburg.
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Three students were arrested by Antioch police and dozens more are being disciplined by the school district, including suspensions.