Concerned over growing Left wing extremism in various states, the central government has decided to allocate Rs 500 crore during the 11th Plan for the development of infrastructure in naxal-hit areas.The new scheme is aimed at providing mobility to the police by upgrading existing roads and tracks in inaccessible areas and securing camping grounds and helipads at strategic locations in remote and interior areas, home ministry sources said.Helicopters have been provided to affected states for rushing central para-military forces and evacuating injured people and security personnel but state governments are unable to make the right use of the machines due to the absence of helipads.The scheme, which is fully funded by the centre, also seeks to provide security to police stations and outposts by strengthening those at risk of attack due to their dilapidated condition, the sources said.There have been several incidents of naxals storming police stations in Chhattisgarh, Jharkhand and Orissa in which personnel have been attacked and arms looted by rebels.