Robin Williams’ daughter has abandoned her online social media accounts in disgust following what she called “cruel and unnecessary” messages sent to her following her father’s death.

Zelda Williams, 25, wrote that she was deleting her Twitter, Tumblr and Instagram applications from her mobile devices and stepping away “for a good long time, maybe forever.”

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The move came after at least two users upset the grieving actress by sending disturbing images and verbal attacks. In one of her last tweets on Tuesday night, Williams asked fellow users to report her alleged tormentors to Twitter managers. “I’m shaking,” she wrote.

Wellwishers and fans online rallied to her defence, and the accounts of both alleged bullies were suspended by Wednesday.

On Instagram, Williams alluded to users being hateful following her father’s suicide: “In this difficult time, please try to be respectful of the accounts of myself, my family and my friends. Mining our accounts for photos of dad, or judging me on the number of them is cruel and unnecessary.”

A message seeking comment from the Williams family’s publicist wasn’t immediately returned.

* Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or Suicide Call Back Service on 1300 659 467.