Dehradun, April 23 -- The Dehradun Police has stepped up security arrangements ahead of Vice President CP Radhakrishnan's visit to the city on Thursday. Superintendent of police (city) Pramod Kumar said around 600-700 personnel will be deployed across the city. "All security arrangements have been tightened," he said. On Tuesday, senior officers, including Garhwal inspector general of police Rajiv Swarup, briefed personnel assigned to security duty for the visit. Officials directed all personnel to remain alert and vigilant, given the prevailing security scenario. They were asked to report to their duty points at least three hours in advance, obtain detailed briefings from supervising officers, and thoroughly check their deployment areas and nearby locations. Strict verification of all attendees will be carried out, with entry permitted only after proper checking and frisking. Intensive checking drives will be conducted along the VVIP route and surrounding areas to identify suspicious individuals. Police have been directed to ensure complete verification of residents in high-rise buildings along the route and to carry out anti-sabotage checks of buildings, water tanks, flyovers and other vulnerable locations using bomb disposal and dog squads. Only authorised people and vehicles will be allowed entry after due checking. Officials said close monitoring will be maintained on individuals meeting the vice president, with access restricted to pre-identified persons after security clearance. Entry and exit points will be equipped with door frame and hand-held metal detectors, and all individuals will be screened before being allowed to take designated seating. To prevent any stampede-like situation after the programme, personnel have been asked to regulate crowd movement through public address systems and ensure orderly dispersal. Police personnel have also been instructed not to use mobile phones during duty or leave their posts without permission, warning that any negligence will invite strict action. Drone operations have been completely prohibited in and around the venue during the VVIP visit....