Microsoft says it has prevented an attempted attack by Russian hackers against US conservative political groups.
The company said it detected attempts to mimick domains belonging to several conservative groups, apparently with the aim of redirecting traffic to the sites and stealing logins and other credentials from users.
Microsoft said in a statement that it was able to gain control of the hijacked domains, which belonged to political organisations, including the International Republican Institute and the Hudson Institute think tanks.
The Russian hacking group Fancy Bear was said to be behind the attacks.
In a blog posting, Microsoft said: "We're concerned that these and other attempts pose security threats to a broadening array of groups connected with both American political parties in the run-up to the 2018 elections."