Two US senators demand answers from TikTok about a "depraved" test that withheld a safety feature from 10% of US users, including a teenager who died by suicide (Olivia Carville/Bloomberg)

U.S. Senators have subpoenaed TikTok for details on a “depraved” experiment that disabled a suicide-prevention safety feature for roughly 10% of American users, a group that included a teenager who later died by suicide. The lawmakers allege the test violated the platform’s duty to protect users and are seeking documentation of the test’s design, scope, and any internal communications about its risks.