Nigeria’s telecommunications agency has warned a new TikTok trend called the Invisible Challenge could expose devices to malware.

The craze urges users to film themselves naked, then to use TikTok’s “Invisible Body” filter to replace their body with a blurry background.

But officials say some users have started attaching a link to videos which downloads a virus onto devices.

The Nigerian Communications Commission (NCC) says users’ data is then stolen.

Attackers are attracting users by uploading videos to TikTok as part of the trend, but attaching a link to a software known as “unfilter”, which claims to be able to remove the filter from the video.