The Canadian Security Intelligence Service’s website was temporarily down Monday night following a second cyberattack on federal government sites in less than two weeks.

Sources tell CTV’s Mercedes Stephenson that a rogue hacker had launched what appeared to be a denial of service attack.

Jean-Christophe de Le Rue, a spokesperson for the ministry of public safety and emergency preparedness, acknowledged in a statement that the CSIS website was "temporarily offline."

"No information has been breached. We are taking cybersecurity very seriously," de Le Rue said.

Sources say the same person was previously responsible for cyberattacks on several municipal and police websites. The hacker is trying to draw attention to the controversial Bill C-51, as well as the case of an Ottawa teen who was charged in an alleged "swatting" incident. The hacker believes the teen was framed, sources say.

The same person was previously connected to hacking group Anonymous, but appeared to be operating alone on Monday, sources say.

The person believed to be responsible tweeted out several messages about the CSIS website Monday, including: “I’m deciding if I should let CSIS back online and hit another government website, or if I should keep it offline for a while.”

Less than two weeks ago, several government websites, including ServiceCanada.gc.ca and Parl.gc.ca, were hit by a cyberattack. Anonymous claimed responsibility and Treasury Board President Tony Clement confirmed that a denial of service attack took place.