Medals will not be awarded Monday in two events at the Sochi Winter Olympics, after heavy fog forced organizers to postpone competition.
The men's biathlon 15-kilometer mass start is now scheduled for Tuesday, after being delayed by fog for a second day.
Officials also postponed the men's snowboardcross preliminary rounds and final because of the fog, but did not immediately announce a new time for the event.
The changes leave five medal events set for Monday, including a showdown in the ice dance competition between Canada and the United States.
Americans Meryl Davis and Charlie White lead the competition going into the decisive free dance, but face a stiff challenge from Canadians Tess Virtue and Scott Moir.
Meanwhile, the first bobsled medals of the games will be decided, along with a biathlon event for women - weather permitting.
Four countries won Olympic gold medals Sunday, with the Netherlands sweeping the top three places in the 1,500-meter women's speedskating event.
Dutch skater Jorien ter Mors set a record in winning the Gold, defeating two teammates, favorite Ireen Wust, who finished second, and Lotte van Beek.
Norwegian skier Kjetil Jansrud won the men's super-G. The Czech Republic won its first gold medal of the Games when Eva Samkova, wearing a fake moustache for good luck, took the women's snowboarding cross event. Sweden took the gold in the men's four by 10-kilometer cross country relay.
The top five nations leading the total medals race at the end of Sunday's competition are Netherlands with 17, host Russia and the United States with 16 each, and Norway and Canada with 14 each. Germany leads the gold medal count with seven, followed by Netherlands, Norway and Switzerland with five each.
Switzerland's Joel Gisler jumps during a freestyle skiing training session in the halfpipe at the Rosa Khutor Extreme Park, Feb. 17, 2014.
Athletes train as fog enshrouds the course of the men's biathlon 15k mass-start, at the 2014 Winter Olympics, Feb. 17, 2014.
Yuna Kim of South Korea skates during a practice session at the figure stating practice rink at the 2014 Winter Olympics, Feb. 17, 2014.
China’s Liu Yin shouts instructions from the house during a round robin match against Japan at the 2014 Winter Olympics, Feb. 17, 2014.
Britain's Anna Sloan shouts after delivering the stone during women's curling competition against Russia at the 2014 Winter Olympics, Feb. 17, 2014.
A snowboarder goes through a tunnel near the alpine skiing training slopes at the Sochi 2014 Winter Olympics, Feb. 17, 2014.
Cross-country skiers train in front of the olympic rings at the Laura biathlon and cross-country ski center, at the 2014 Winter Olympics, Feb. 17, 2014.
The United States' Nick Baumgartner jokes with Canadian athletes as they wait for the start of men's snowboard cross competition that was later cancelled due to fog at the Rosa Khutor Extreme Park, Feb. 17, 2014.
Australia fans dress up for the men's snowboard cross competition at the Rosa Khutor Extreme Park, Feb. 17, 2014.