TikTok became unavailable to U.S. users over the weekend as a government ban over national security concerns took effect. While TikTok was the highest profile app impact by the ban, other apps from developer ByteDance also were affected.

Apple Inc. and Google removed TikTok from their mobile app stores in the US as required by a law that took effect Sunday, after the social media company’s legal challenges failed to head off the measure passed last year to address national security concerns.