Pulwama attack due to intelligence failure: Mamata

West Bengal Chief Minister Mamata Banerjee Friday said the terror attack in J&K on a CRPF convoy at Pulwama which claimed 40 lives was due to "intelligence failure" and demanded that there be three-day nationwide mourning to show respect to the slain jawans. Questioning the role of the national security adviser, she said "We have the right to know what had actua more