The Government today said the case of Pakistani-American David Headley showed the time has come to “think the unthinkable” as terrorists were working on new strategies to break the country’s security.

“As we have seen from the David Headley case that one can still slip through the radar. Because we are not looking for them. This is one of the big problems. Because nobody would look for a US citizen, with a US passport and a business visa, you would not think that he is a terrorist,” Union Home Secretary G.K. Pillai, said.

The Home Secretary said if it can happen to a US national, it can happen to citizen of any other country and favoured necessary steps to deal with such cases.

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