"No country is free from terror. We are more vulnerable as we are closest to the epicentre of terror - Pakistan and Afghanistan," Chidambaram said here.
"Former Afghan president Burhanuddin Rabbani was killed yesterday in a highly protected area of Kabul ... No city is completely invulnerable," he said.
"We try to be vigilant 24X7. We have asked the police forces to be vigilant despite all the deficiencies.
"Capacity is not sufficient to pre-empt possible attacks, for which intelligence gathering, investigation and a counter-terrorism agency backed by advanced technical network to bringing in all the data will have to be in place," he said adding the Centre would build National Counter Terrorism Centre soon.
Giving statistics of terror attacks in the country, he said it started since 1998 and 17 major incidents took place between 1998-2003.
The worst period was 2005 to 2008 when 29 major terrorist attacks occurred, including 26/11.
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