Changi Airport came under a "terror attack" early this morning - and multiple agencies dealt successfully with the threat - all as part of Exercise Northstar. In this photo taken during a media preview last week, police officers can be seen directing members of the public during an anti-terror drill in preparation for the exercise, which took place between 1am and 3am this morning. Multiple agencies were involved in the exercise, including the Singapore Police Force, Singapore Civil Defence Force, Singapore Armed Forces, Ministry of Health, Civil Aviation Authority of Singapore and Changi Airport Group. The exercise sought to boost coordination among government agencies as well as with stakeholders in the aviation sector, to ensure that they remain prepared to respond to possible terror attacks here. A second phase of Exercise Northstar will be held on Oct 28.