Insisting he was not anti-vaccine but simply against a certain preservative in some vaccines, comedian Jim Carrey on Wednesday launched a Twitter attack on California Gov. Jerry Brown, who signed a state law Tuesday requiring vaccinations for children attending public school.

"California Gov says yes to poisoning more children with mercury and aluminum in manditory [sic] vaccines," Carrey, 53, tweeted. "This corporate fascist must be stopped."

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He later wrote, "They say mercury in fish is dangerous but forcing all of our children to be injected with mercury in thimerosal is no risk. Make sense? I am not anti-vaccine. I am anti-thimerosal, anti-mercury. They have taken some of the mercury laden thimerosal out of vaccines. NOT ALL!" He directed people to the website for a documentary and a book on thimerosal by environmental-law attorney Robert F. Kennedy Jr., son of the late U.S. Attorney General.

Carrey has been vocal about this issue since his relationship with actress Jenny McCarthy, whom he dated from 2006 to 2010. McCarthy, who is mom to Evan Asher, 13, believes her son's autism was caused by vaccines.

As his Twitter followers posted arguments against his position, Carrey became strident, with capital-letter posts including, "I am PRO-VACCINE/ANTI-NEUROTOXIN, Get that straight. . . . TOXIN FREE VACCINES, A REASONABLE REQUEST."

Brown's office told Newsday, "The Governor clearly articulated his position in [Tuesday's] signing message," which stated, "The science is clear that vaccines dramatically protect children against a number of infectious and dangerous diseases."