A website dedicated to leaking personal information about Immigration and Customs Enforcement officers and Border Patrol agents was reportedly subject to a cyber attack that its founder believes may have originated in Russia.

Dominick Skinner, a Netherlands-based immigration activist, told The Daily Beast that his website, ICE List, came under cyberattack Tuesday evening after the publication reported Skinner planned to release personal information, obtained through a whistleblower, about thousands of employees.

The attack, known as a Direct Denial of Service, is when a perpetrator seeks to disrupt access to a network or service by flooding it with superfluous requests in an attempt to overload the system.

Skinner told The Daily Beast that a massive number of IPs began accessing the website and a large amount of the traffick appeared to come from Russia – leading the founder to speculate the attack originated there.