BBC World Service - Newsday

WHO: Airborne transmission of Covid may be possible

We speak to one of the scientists who signed a letter to the health organisation

Social media companies say they'll prevent police in Hong Kong using their data

Hong Kong's leader Carrie Lam says she will 'vigorously implement' new security law

Tik Tok pulls out - while other social media firms say they will no longer help police

We speak to a resident in one of the tower blocks which have been quarantined

The border between Australia's two most populous states is closed after increase in cases

The decision follows a spike in infections in the Victorian capital, Melbourne

Cause of incident at country's main nuclear fuel production site at Natanz as yet unknown

Ghislaine Maxwell has been accused of helping to groom victims known to be underage.

Texas joins other states in making the use of face masks compulsory