Several parents at the Viewpoint School in L.A. tell TMZ, a meeting was held Thursday night to address Sheen's Twitter rant, in which he ordered his millions of fans to deface Viewpoint with dog feces, rotten eggs, and toilet paper.
Sheen says he urged his fans to exact revenge on the school after it did nothing to address a bullying situation involving his 9-year-old daughter Sam ... whom Sheen removed from Viewpoint last May. It's unclear why he waited until this week to sound off.
But parents aren't letting it slide -- multiple people who were present at the meeting tell TMZ, parents feel Sheen's threat is not over ... and any one of Sheen's millions of fans could act out any time.
As far as they're concerned, Sheen has demonstrated over and over that he's a credible threat and a violent person -- and brought up the litany of allegations the actor has faced over the years ... including claims he threatened to shoot someone with a super 90, held a knife to his ex-wife's throat, shot Kelly Preston, and trapped a hooker in his hotel room (he was never prosecuted for any of the alleged incidents).
We're told the parents plan to get in touch with authorities to get the ball rolling. Calls to Charlie were not returned.