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Charlie Sheen has not calmed down since his Twitter rant last week in which he urged his followers to throw rotten eggs, toilet paper or dog feces at his 9-year-old daughter's former California school.

On Monday, the "Anger Management" star suggested in a lengthy Twitter poem that his ex-wife, Denise Richards, and their daughters Sam, 9, and Lola, 7, have been harassed by supporters of the school, Viewpoint, since then.

Sheen wrote, "a group of mindless Viewpoint supporting doosh-bagz have targeted D and the girls with 'bullying tactics' as a response to my call to arms. so, bullying is the answer? as a response to bullying? leave them alone."

The actor vowed that "justice will be served." He dared the perpetrators to "show yourselves you spineless cowards. oh that's right; cockroaches scatter in the light. FYI - we have your faces on camera. police are involved."

Read More About Charlie Sheen's Attack on 'Bully' School

Sheen later told TMZ that a threatening note had been stuck to a tree with a knife outside the children's home.

Following his initial tirade last week, Viewpoint, without mentioning Sheen by name, said in a statement that it investigated the bullying accusations last year and that it "addressed the issue appropriately at that time." The school also said that the student in question has not attended the school since March 2012.