Indian Home Minister P Chidambaram on Friday reiterated that India lives in perhaps the most difficult region and that the global epicentre of terrorism is in the country's immediate neighbourhood. "In a world of complex challenges, including new and emerging forms of threats, terrorism remains a principal challenge for our two countries. The events of the past few days, especially inside Pakistan, speak to the successes and to the enduring risks and challenges. Despite extraordinary efforts and significant successes against the forces of terrorism, its threat remains strong," said Chidambaram in his opening remark at a meeting with US Homeland Security Secretary Janet Napolitano. He added, "It is a truism to say that India lives in perhaps the most difficult neighbourhood in the world. The global epicenter of terrorism is in our immediate western neighbourhood. The vast infrastructure of terrorism in Pakistan has for long flourished as an instrument of state policy." The Indian home minister also said, "Today, different terrorist groups, operating from the safe havens in Pakistan, are becoming increasingly fused; the society in Pakistan has become increasingly radicalized; its economy has weakened; and, the state structure in Pakistan has become fragile. Today, Pakistan itself faces a major threat from the same forces. Its people as well as its state institutions are under attack." Napolitano arrived in India on a four-day visit Tuesday to boost counter-terrorism ties between two sides. Her first stop was in Mumbai where she paid tributes to the victims of the Mumbai attack and laid a wreath at a police memorial there. She held talks with Maharashtra Chief Minister Prithviraj Chavan who stressed on the need for cooperation with the US, including sharing intelligence and technological know-how for enhancing security.