The Department of Homeland Security is warning Americans planning to attend the 2018 Winter Olympic Games in Pyeongchang that cybercriminals are likely to be targeting the Games.

Officials in South Korea are facing a double threat. At the Olympic Committee’s Security Command Center in an unmarked facility in Pyeongchang, security experts from around the world are monitoring threats from North Korean hackers who have been probing the computer networks that manage South Korean finance, media and critical infrastructure systems for years.

And while some people believe that diplomatic efforts may have eased the North Korean threat to the Games, others are bracing for the impact of a hacking campaign by Russian groups retaliating for a ban on Russian athletes. Security companies said these groups had successfully targeted the computer systems of Olympic-related organizations months ago.

Just how those hacks could lead to broader attacks is not clear. But cybersecurity researchers said the Olympic Games — more digitized than ever — are ripe targets for hackers searching for embarrassing information on everyone from athletes to organizers or simply looking to cause trouble by manipulating scoring or lighting systems.