NEW DELHI (Agencies) - India's Prime Minister on Friday summoned his military chiefs to a meeting amid tensions with rival Pakistan over last month's carnage in Mumbai, officials in New Delhi said. Manmohan Singh was closeted with the chiefs of air force, navy and the million-plus army to review "India's defence preparedness", an official from the premier's office said. "The three chiefs made presentations on India's defence preparedness and reviewed conventional military threat scenarios as well as counter-measures now in place," the official, who did not want to be named, told AFP. The meeting was held at the Indian Prime Minister's Office (PMO) in South Block to review the security situation in the country. Army chief General Deepak Kapoor, Navy chief Admiral Sureesh Mehta and Air Force chief Air Marshal Fali S Major briefed the Prime Minister about the steps taken by the defence forces following heightened tensions with Pakistan. They also spoken about the long-standing procurement issues. The meeting was also attended by National Security Advisor MK Narayanan. This is the third time the service chiefs met the PM since the increased tension with Pakistan. All three wings of the armed forces are already on a state of high alert. Last week too, Manmohan had called a meeting with the three defence chiefs which was also attended by Defence Minister AK Antony, External Affairs Minister Pranab Mukherjee and Narayanan. During the meeting, conducted in the Indian Army's War Room in South Block, the Prime Minister had evaluated the security preparedness across the country. Earlier, Union Home Minister P Chidambaram sent a warning to states and Airports Authority of India and security agencies against possible terror attacks at the airports. He also wrote a letter wrote to Maharashtra Chief Minister Ashok Chavan that the state must crack down on organised crime. He warned that the underworld could take advantage of the current situation in the state with the police concentrating on the Mumbai terror investigation. Meanwhile, a senior Indian Border Security Force (BSF) official asked the personnel of the force, deployed in areas of north-west Indian state of Rajasthan bordering Pakistan, to remain physically and mentally prepared for any kind of eventuality. Addressing jawans in border areas of Rajasthan, BSF ADG U K Bansal said though there was not a war-like situation but they should remain mentally and physically ready to face any kind of challenge. Bansal, who is on a three-day visit to review security in border areas of Rajasthan, Thursday went round the sensitive border posts in Jaisalmer. He termed the reports in a section of media that villagers on the border areas have been asked to evacuate the area as "rumours". Meanwhile, with tension escalating between India and Pakistan, New Delhi has beefed up security at the Rajasthan Atomic Power Station at Rawatbhata here, site Director of RAPS C P Jhamb said on Friday. He said the CISF stationed in and around the plant has been put on full alert. Jhamb said that in case any information of disturbance is received the plant would be handed over to army. He said an extraordinary meeting of all concerned parties, including civilian and army and district officials, is scheduled for January 7 at RAPS for finalising an emergency exercise to meet any exigency.