The fiancee of Saudi journalist Jamal Khashoggi and a human rights organization he founded shortly before his death have accused Crown Prince Mohammed bin Salman of ordering Khashoggi’s killing to “permanently silence” his advocacy for democratic reform in the Arab world.

In a federal lawsuit filed Tuesday in Washington, D.C., Hatice Cengiz and Democracy for the Arab World Now (DAWN) alleged that Khashoggi was tortured, murdered and dismembered “pursuant to a directive of Defendant Mohammed bin Salman.”

The crown prince and two dozen named co-defendants “saw Khashoggi’s actions in the United States as an existential threat to their pecuniary and other interests and, accordingly, conspired to commit the heinous acts that are the subject of this suit,” it said.

Attorneys Keith M. Harper and Faisal Gill, who are representing Cengiz and DAWN, said in a videoconference Tuesday with reporters that the focus of the lawsuit is to have a court of law in the United States hold Mohammed liable for Khashoggi’s killing and to obtain documents in both Saudi Arabia and the United States that reveal the truth.