Very primitive type of work. One thing is first you should not select a place where CCTV to place a bomb, unless you are a suicide attack. Next is to arrest the informant. This cannot happen unless there are good evidence to suspect informant. Next to make a mountain out of mole hill. (there are so many hand grenades or hand made bombs in this area . So placing such a device in church cannot be big such a big discovery. This is not the same as discovering heavy explosives in a remote area.
so any person with reasonable mind may smelt the rat in this incident. I felt sorry for the informant as he became a victim to this 'Drama'