Check this out from Kim. From the last Olympics held there: "Shooters were escorted from Heathrow under armed guard and their guns were taken in an armoured vehicle to the national shooting centre at Bisley. Spectators had to watch events behind screens, and shooters were guarded by armed officers even during training.
This is exceeded only by the crap in Japan. Every gun had to be locked in a vault as soon as the event was over(no time for cleaning, etc), was only allowed to be checked out just before an event, and each competitor had to find and turn in every fired cartridge case. Apparently the idiots thought some yakuza would find them and reload them. Oh, that's right, the bandits just use guns smuggled in. Never mind, they couldn't let those evil bits of brass lay around where some innocent might find them! Etc.