The social media company formerly known as Twitter has been accused in a revised civil US lawsuit of helping Saudi Arabia commit grave human rights abuses against its users, including by disclosing confidential user data at the request of Saudi authorities at a much higher rate than it has for the US, UK, or Canada.

The lawsuit was brought last May against X, as Twitter is now known, by Areej al-Sadhan, the sister of a Saudi aid worker who was forcibly disappeared and then later sentenced to 20 years in jail.

It centers on the events surrounding the infiltration of the California company by three Saudi agents, two who were posing as Twitter employees in 2014 and 2015, which ultimately led to the arrest of al-Sadhan’s brother, Abdulrahman, and the exposure of the identity of thousands of anonymous Twitter users, some of whom were later reportedly detained and tortured as part of the government’s crackdown on dissent.