An Israeli firm accused of supplying spyware to governments has been linked to a list of tens of thousands of smartphone numbers, including those of activists, journalists, business executives and politicians around the world, according to reports. The NSO Group and its Pegasus malware -- capable of switching on a phone's camera or microphone, and harvesting its data -- have been in the headlines since 2016, when researchers accused it of helping spy on a dissident in the United Arab Emirates.