Hackers have attacked Czech Republic government websites to protest the country’s decision to block the domains of unauthorized online gambling operators.

Last week, the Czech senate overwhelmingly approved the country’s new gambling legislation, which would open up the market to international online operators for the first time, while imposing blocks on the domains of sites not holding a Czech license.

On Tuesday, Novinky.cz reported that the Senate’s official website Senat.cz had been knocked offline Monday night following a distributed denial of service (DDoS) attack by someone claiming to be associated with the Anonymous hackers collective.

An English-language statement accompanying the attack claimed that the Senate’s website had been targeted “because you passed a law to prevent free access to the Internet.” The statement warned that this wasn’t the last time the government would hear from the hackers on this issue.