Can we blame the police?

A major question being asked is was this an intelligence failure? The news floating around is that intelligence network had prior info. from Srinagar that there would be a series of blasts in local trains. How much of it is true only top guys would be knowing and I doubt if the real truth would be ever disclosed. But even if the police didn't have any info. I don't think an attack like this could have been prevented. Local trains serve as a soft target especially during peak hours. In jam packed hours, you are more concerned finding a foot hole for yourself - who has time to think what's kept in the luggage rack.