https://www.reuters.com/article/us-hongkong-protest-cook/apple-ceo-cook-defends-removal-of-police-tracking-app-used-in-hong-kong-idUSKBN1WP2SZ >Apple Inc Chief Executive Tim Cook on Thursday defended the iPhone maker's decision to remove from its app store a police-tracking app used by protesters in Hong Kong, according to a copy of a letter to employees seen by Reuters and confirmed by Apple.