A website dedicated to naming ICE and Border Patrol employees is coming under a “prolonged and sophisticated” cyber attack after the Daily Beast revealed it planned to make public 4,500 names of federal immigration staff.

The founder of ICE List said the website was overwhelmed by malicious web traffic originating in Russia after the Beast reported that a huge cache of personal IDs had been leaked to the site by an alleged Department of Homeland Security whistleblower.

The Direct Denial of Service (DDOS) assault, which began on Tuesday evening and is still ongoing at the time of publication, saw a huge number of IPs simultaneously access the website of ICE List, a self-styled “accountability initiative.”

This has successfully overloaded the ICE List’s servers and is preventing people from accessing the site. The timing coincided with ICE List founder Dominick Skinner telling the Daily Beast he would make public the first tranche of names in the dataset, which was leaked following the shooting by an ICE agent of mom Renee Nicole Good.