HONG KONG—Hong Kong police arrested five directors of the Apple Daily newspaper early on Thursday morning, including its editor-in-chief, the media outlet said, in the latest blow to the newspaper’s jailed owner Jimmy Lai. Hong Kong Police’s National Security Department said in a statement that five directors of a company had been arrested on suspicion of collusion with a foreign country or with external elements to endanger national security. It said only that the five included four men and a woman aged between 47 and 63. It did not provide other details. Apple Daily said five of its directors, including editor-in-chief Ryan Law, chief executive officer Cheung Kim-hung, Chief Operating Officer Chow Tat-kuen, Deputy Chief Editor Chan Puiman and Chief Executive Editor Cheung Chi-wai had all been arrested in morning raids. The newspaper said that at about 7:30 a.m. local time around 100 officers arrived at its headquarters in Tseung …