Amazon has asked its employees to delete the Chinese-owned video app TikTok from their cellphones, citing “security risks,” according to a company email sent on Friday. In the email, which was obtained by The New York Times, Amazon officials said that employees must delete the app from any devices that “access Amazon email.” Employees had to remove the app by Friday to remain able to obtain mobile access to their Amazon email, the note said. Amazon workers are still allowed to view TikTok from their laptop browser, the company added. Amazon and TikTok did not immediately respond to requests for...