How use of technology can avoid blasts
After the blasts, One thing comes to my mind, can we use technology to avoid bomb blast in high density public places like trains, busses, temples, bus stands etc.

The first thing that comes to my mind is use of frequency jammers so that remote controlled explosives will be neutralised. This will also mean that Mobile Phones will not work in those areas.

Metal Detectors, Automated entry machines which give entry only on producing the right tickets or passes will also help.

Please post your ideas.