UK intelligence agency GCHQ "intercepted and stored" the webcam images of internet users who were not suspected of any wrongdoing, the Guardian claimed, citing secret documents.
Files dated between 2008 and 2010 allegedly show a monitoring programme, known as "Optic Nerve", stored still images from Yahoo webcam chats and saved them to agency databases with the help of its US counterpart the National Security Agency.
GCHQ has consistently said its activities are necessary and "carried out in accordance with a strict legal and policy framework”.
More top news
Opportunities were missed to prevent two teenage British Muslims being radicalised before they were killed fighting in Syria.
Charlie Gard will "inevitably" die shortly after being moved to a hospice and having life-support treatment withdrawn.
Cody-Anne Jackson, who made a "sham" 999 call, several hours after suffocating Macey Hogan, will serve at least 16 years in jail.