05:06Newsday13/02/2023 05:06 GMT : Mystery continues to surround 'objects' shot down by the USBBC World Service Duration: 50 minutes Mon 13th Feb 2023, 05:06 on BBC World Service East AsiaAvailable for yearsListen nowA US air force general said he was unable to determine how they stayed aloft. Show more GenresNewsFormatsMagazines & ReviewsBrandNewsday Source: BBC Online