05:06Newsday23/02/2021 05:06 GMT : US records over 500,000 Covid-19 deathsBBC World Service Duration: 53 minutes Tue 23rd Feb 2021, 05:06 on BBC World Service OnlineAvailable for over a yearListen nowPresident Biden has called it a 'heartbreaking milestone'. Show more GenresNewsFormatsMagazines & ReviewsBrandNewsday Source: BBC Online