Colin Dwyer

Updated at 7:40 p.m. ET

Walmart and Dick's Sporting Goods say they won't sell guns to customers under 21, and both are putting new restrictions on ammunition sales.

Dick's Sporting Goods, one of the largest sports retailers in the U.S., has announced it is immediately ending its sales of military-style semi-automatic rifles and is requiring all customers to be older than 21 to buy a firearm at its stores. Additionally, the company no longer will sell high-capacity magazines.

The South Korean women's curling team, hometown rock stars of these Winter Games, put on quite a show for a rollicking arena in Pyeongchang on Friday. The team defeated Japan in the semifinals, 8-7, claiming the nail-biter victory only after both teams went tied into an extra end.

For the hundreds of thousands of Rohingya Muslims who have fled Myanmar and what authorities describe as a brutal campaign of ethnic cleansing, the prospect of returning to their home villages might be more than just daunting. As satellite photographs show, a return home might be simply impossible.

It wasn't the Miracle on Ice, exactly — but when the U.S. men's curling team squared up with their Canadian counterparts in the Olympic semifinal, few could have expected what happened next. Canadian men have won gold at each of the past three Winter Games, after all, and Americans had never — ever! — won an Olympic semifinal.

That all changed Thursday.

The U.S., led by captain John Shuster, shocked the traditional powerhouse in the close contest, riding a late surge of momentum to win 5-3.