This is like Newton's dilemma! Like him police think that Cats kitten must have smaller door! Police didn't do thorough job of busting entire network and sat on their laurels after busting few.They took all the fame and prizes all over India but didn't look in their own city.Now any terrorist activity is not a childs' play and has to be very precisely planned & executed.Some time ago it was tomtomed that there were CCTV cameras placed all over city at 100s of crores cost.Also they think that terrorist entered at Churchgate and placed bombs with timers. It is all the complacency:Those people must have boarded locals at Mumbai Central and got down at Churchgate! All people in hurry to grab seats never looked if bombs were in the bags. And who is to question for leaving bags? Also there are reports that bombs were detonated by remote. Since there can be only 2trains leaving Churchgate at time, they had to wait some 10-15mins to load all things and report to Master. The Master had detonated with mobiles and police aren't tracing international calls in that time slot. Going here & there won't solve the problem and they need to look these facts. But who would do it?