Part 1 35 He even follows X for a short while during his beat hours and in uniform. He also reports his findings through appropriate channels. A specialized unit identifies X and Y on the basis of public registers (i.e., of residents, health or welfare service clients, licensed drivers, or those with criminal records). During the following week, more information obtained led to a grounded suspicion that X and Y are planning a terrorist bomb attack at a major public event. Consequently, an investigation of X and Y is opened and a surveillance operation ordered on both men to identify any associates they might have, as well as to discover the location of the intended attack. One evening, a surveillance unit follows X from his home as he walks into the city centre. In front of a bank he meets Y, and the meeting is photographed. Both men walk to a nearby parked car and get into it. They drive away with Y at the steering wheel. This too is photographed. They drive to the city’s football stadium and are followed inside. There is a CCTV system in operation at the stadium, which is made known by notices at various points around the stadium and by the fact that the cameras are easily visible. Two of the surveillance team go to the CCTV control room and observe the section in which X and Y are seated. It is seen that they sit and converse with a third man, Z, who was unknown to the police prior to this meeting. The meeting is recorded using the CCTV system. During the match, one of the surveillance team enters Y’s car using a duplicate key, and plants both a listening device and a tracking device, so that any conversations can be recorded and visible contact with the vehicle re-established should it be lost during surveillance. After the match, all three men leave together and drive away in Y’s car. They go to the home of X and are seen to enter. The house is watched. It is then seen that a light is switched on in a downstairs room. The curtains are open and the three men are visible inside, sitting around a table talking and reading some documents. One of the surveillance team uses a camera with a high powered telephoto lens to photograph the occupants of the room.