Twitter Inc. suspended the account of Martin Shkreli after the brash former pharmaceutical executive harassed a female reporter online, the latest high-profile case of abuse on the social media service.

Over the past few days, freelance reporter Lauren Duca posted about several unwanted digital advances by Shkreli, the former chief executive officer of Turing Pharmaceuticals AG, including a message in which Shkreli invited her to the inauguration of President-elect Donald Trump. Unbowed, Shkreli proceeded to post about Duca publicly, prompting her to ask Twitter CEO Jack Dorsey to intervene on Sunday.

“The Twitter Rules prohibit targeted harassment, and we will take action on accounts violating those policies,” a Twitter spokesman said in a statement Sunday. The rules allow Shkreli to appeal his suspension, but he would have to make changes to his account before being reinstated. Shkreli declined to comment via e-mail.

Twitter has struggled to curb harassment on its service. Late last year, it introduced new tools to help users protect themselves, and it suspended some accounts of prominent white supremacists.

Technology news website The Verge reported the suspension of Shkreli’s Twitter account earlier.