authenticate

BBC Verify has authenticated footage showing around 30 bodies wrapped in shrouds and blankets next to the mosque, which was located in the west of the city.

We did this by reviewing and authenticating thousands of leaked and gathered documents.

The BBC analysed the footage and was able to authenticate it as genuine.

It was found in a house in Cambridge and has since been authenticated as an original.

"The recordings are critical for establishing her role, they are clear and have been properly authenticated, and are supported by other evidence," British international human rights barrister Toby Cadman told the BBC.