taking these threats seriously. >> reporter: u.s. authorities are following closely one terror threat tied to the election, and a cyber attack by russia is under way and has been for weeks. u.s. officials do not believe cyber attacks can alter the result, but they see an effort to undermine confidence in the vote. tonight, growing concerns that russia is waging an information operation to sow doubts about the u.s. election. several u.s. officials tell cnn. >> this is something the department of homeland security, along with state election officials, have been very, very focused on. i have a lot of confidence in the integrity of our ballot counting process. i have a lot of confidence in the security and cyber security around the process run by state and local election officials. >> reporter: here at the department of homeland security cyber command center, they're now monitoring multiple threats.