Indian Government has information of "an ongoing ploy of terrorist groups in Pakistan" preparing to strike India again, Prime Minister Manmohan Singh said on Monday while stressing that cross border terrorism continued to be a major threat. "Cross border terrorism remains a major threat. After the Mumbai terror attacks in November last year we need to take utmost vigilance. We have credible information of an ongoing ploy of terrorist groups in Pakistan to carry out fresh attacks," the Indian Prime Minister said while addressing a meeting on internal security attended by Chief Ministers. "The area of operation of these terrorists today extends far beyond the confines of Indian held Kashmir and other parts (of India). We need to be prepared to counter more sophisticated and enhanced capabilities. We also need to guard our sea frontiers as vigilantly as our land." Dr. Singh said there was need for operational preparedness of Quick Response Teams at the State level, strengthening of State Special Branches and Intelligence wings. He also appealed to all Chief Ministers to extend cooperation to the newly set-up National Investigation Agency, empowered to deal with terror related crimes across the country. Four regional hubs of the National Security Guards (NSG) have been established at Mumbai, Chennai, Hyderabad and Kolkata, the Prime Minister said. The Chief Ministers are expected to discuss a concerted strategy to defeat Maoist rebels, and for coastal security, border management and modernisation of the police forces.