North Korean leader Kim Jong Un has invited South Korean President Moon Jae-in to Pyongyang for their first ever summit meeting.
Separately, the presidential office said Moon and Kim Yong Nam, the North's ceremonial leader who is leading the delegation, will together cheer their countries' unified female ice hockey team in a match later Saturday.
According to South Korea's Yonghap News Agency, internet-based telecasts were disrupted, and some people who bought tickets online for the opening ceremony said they couldn't print their tickets.
The speech led to the isolated nation sending 22 athletes and 500 North Koreans to the Winter Olympics.
Earlier on Friday, Pence said Moon gave his backing to additional measures the United States is planning to try to curb North Korea's missile and nuclear programs, speaking after paying tribute at a South Korean memorial.
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"Special envoy Kim Yo Jong delivered a personal letter" from her brother stating his "wish to improve inter-Korean relations", said Moon's spokesman Kim Eui-kyeom.
The Asian members of the alliance against North Korea saw eye to eye only on the nuclear issue involving North Korea in the past.
Vice President Mike Pence was seated to the left of Moon and just a few feet away from the North Korean delegation in a row behind them.
Her visit has raised speculation in South Korea of a possible meeting between Moon and Kim Jong Un, which would be the first time leaders of the two countries have met in 11 years. The "more" would include undercover intelligence officers under the guise of "support staff" and other titles, a former North Korean police officer says.
During an Olympics reception and at the sporting event's opening ceremony, Pence was not trying to avoid North Korean officials in attendance, the senior administration official told reporters on Saturday, adding that he was trying to ignore them. Pence appeared to leave the door open for negotiations earlier this week when he said, "I haven't requested any meeting". South Korea, meanwhile, has downgraded its demand to a mere, generic aspiration - peace in the Korean Peninsula.
On his way to Asia earlier this week, the USA vice president told reporters he was not seeking direct talks with North Korean officials, "but we'll see what happens".