The Office, together with its employees' living quarters, is located in the Metropark Hotel Causeway Bay Hong Kong building. Separately, the Department for Safeguarding National Security, under the Police Force, was established on the same day. Arrests and charges The first arrest under the national security law was made on 1 July, less than 15 hours after the text for the law was published. A man was arrested for allegedly holding a Hong Kong independence flag in Causeway Bay. On the same day, nine others were arrested on suspicion of violating the national security law. They included people who were calling for independence, or possessing items advocating independence. On 3 July, a man arrested on 1 July who allegedly drove a motorbike into a group of three police officers while flying a “Liberate Hong Kong” banner was charged with one count of inciting secession and another of terrorism. He became the first person to be formally charged under the new law. His case was also the first case involving the National Security Law to reach trial. On 6 July, 2 more were arrested under the national security law during a protest where protesters held out blank papers. A person, calling the police "dirty cops", was warned that they were in violation of the new law. Political exiles since the enactment Nathan Law On 2 July 2020, Nathan Law posted on his social media page that he has left Hong Kong. Later it was known that Law settled in the United Kingdom. Ted Hui On 3 December 2020, Ted Hui, while in Denmark, announced that he would not return to Hong Kong. Cultural On 4 July, it was discovered that at least nine books authored or co-authored by pro-democratic figures, including Joshua Wong and Tanya Chan, have been removed from public libraries. The Leisure and Cultural Services Department, responsible for running the libraries, said in a statement that the libraries "will review whether certain books violate the stipulations of the National Security Law," and that "while legal advice will be sought in the process of the review, the books will not be available for borrowing and reference in libraries." Before the law was enacted, exhibitors of the 2020 Hong Kong Book Fair, to be opened on 15 July, were urged by the Hong Kong Trade Development Council, the organiser, to exercise “self-discipline” and avoid selling “unlawful” books. After the law was