Officials Investigating Possible Cyberattack At Pyeongchang Winter Olympics

South Korean figure skater Kam Alex Kang-chan left and North Korean skater Kim Ju Sik took a selfie together before training at the Winter Olympics in Pyeongchang

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The 2018 Winter Games in Pyeongchang kicked off on Friday with the two Koreans marching under a unified flag in an opening ceremony themed around peace and future.

The games have already come under attack from hackers: Last month, McAfee said that it detected attacks in the months leading up to the games, in the form of malicious e-mails sent to Olympic officials. "One of the main reasons North Korean athletes don't defect is due to their families back in North Korea", Benjamin Young, a doctoral candidate at George Washington University who has researched sports in North Korea, told ABC News' Mae Joo.

The North Korean delegation's visit to South Korea was the first trip since August 2009, when a high-level North Korean delegation attended the funeral of former South Korean President Kim Dae-jung, who held the first-ever inter-Korean summit with then North Korean leader late Kim Jong-il in 2000. On Friday, Moon pointed to the joint Korean women's hockey team - an Olympic first - as a starting point. They shrieked in excitement as the puck dropped and a historic team stepped forward into an unprecedented night. Switzerland defeated Korea 8-0. "At this time we can not confirm (a cyberattack)", he said.

The United State Vice President Mike Pence, (right) and his wife, Karen Pence, applaud during the opening ceremony of the 2018 Winter Olympics in Pyeongchang, South Korea on Friday. Pence fired off a tweet calling the North's participation in the Games a "propaganda charade" and saying the world must not "turn a blind eye to the oppression and threats of the Kim regime". "I was standing and I think the whole team felt very much welcome and this welcome does not depend on who stands and who does not stand", Bach said.

"She's probably one of the most influential people on Kim Jong Un himself, precisely because he has very few people he can trust", said Balbina Hwang, visiting professor at Georgetown University and founder of the National Committee on North Korea. The Koreas are technically still at war, as a truce - and not a peace treaty - ended combat between the countries in 1953.

"We try not to add more stress than there needs to be", Murray said.

South Korean President Moon Jae-in met a 22-member North Korean delegation, which was led by its ceremonial leader Kim Yong-nam at the South Korean presidential office, Cheong Wa Dae (Blue House) on Saturday.

Park Young-sun, a 45-year-old South Korean public servant, said she was pleased to see Kim Yo Jong at Saturday's hockey game, which she called it a "great lesson for my children". "We know this is more than just a game".

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