A new US law banning TikTok has come into effect, hours after the popular app stopped working across the country.
Late on Saturday a message appearing on the TikTok for US users said a law banning TikTok had been enacted, meaning "you can't use TikTok for now".
The video-sharing app was banned over concerns about its links to the Chinese government. It was given until 19 January to be sold to an approved US buyer to avert the ban.
President Joe Biden had said he would leave the issue to his successor, Donald Trump. The president-elect has said he will "most likely" give TikTok a 90-day reprieve from a ban once he takes office on Monday.