Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: An Arab tourist was arrested under the Terrorism Act after filming himself on his mobile phone outside a shopping centre. Nasser Al-Ansari was detained in a police van for three hours before police decided 'there was no immediate threat' - but officers kept his mobile phone for further investigation. The 38-year-old had been recording a Snapchat condolence message in Arabic for terrorist bombing victims in his native Kuwait, where 27 were killed in a blast by ISIS last week. He was ordered to delete the footage, taken outside Churchill Square shopping centre in Brighton, by a store security guard but refused because he did not see why he had to.Nasser Al-Ansari was recording condolence video for Kuwait bomb victimsConcerned security at Churchill Square shopping centre called in policeOfficers detained him for three hours after arrest under the Terrorism ActMr Al-Ansari was released but the police have refused to give back iPhone 
 Question:'We always work closely with _ security and the decisions on the day by them and by our officers who attended were made with the overriding aim of keeping the public safe.'
Output:
Churchill Square