In particular, the cyber agency is warning Canadian organizations to be on their guard given reports of distributed denial of service attacks from Russian-linked actors.

The "D-DOS" attacks that hit multiple state websites on Tuesday render a website temporarily inaccessible by flooding it with inauthentic internet traffic.

U.S. authorities announced Friday the arrest of a man in connection with cyberattacks and attempted extortion on a U.S. law website, several Canadian and Australian news sites that refused to scrub his name from the internet.