NEW DELHI (Agencies) - The discovery of at least nine very powerful Cobalt-60 sources of nuclear radiation, which have fatally infected five persons in a West Delhi industrial area, has sent shock waves among the local population as well as nuclear establishment in India. Experts fear that many more people might have been exposed to strong radiation and would be in need of immediate medical attention. According to media reports, panic gripped Mayapuri industrial locality after news broke out that exposure to a 'mysterious shining object had resulted into emergence of strange symptoms in the owner of a scrap shop who was admitted to hospital on April 4. Indias scientific community was alerted once the doctors diagnosed symptoms as a result of exposure to strong doses of nuclear radiation. Nuclear and medical experts from Bhabha Atomic Research Centre and the Narora Atomic Power Plant in Uttar Pradesh were rushed to the site to scan the area and help doctors confirm the diagnosis. Cobalt-60, a radioactive isotope of Cobalt was confirmed as the source of radiation. According to the experts this is not the first incident where radioactive material has found its way to unauthorised places in India raising the spectre of it being used in nuclear terrorism. Security at Indian nuclear facilities has been breached time and again when nuclear material was stolen from nuclear installations. As late as November 2000 Indian police seized 57 pounds of uranium and arrested two persons for illicit trafficking of radioactive material. Lack of security at the Indian nuclear plants was underscored recently when on Nov 25, 2009 some rogue elements at the Kaiga Atomic Power Station in Karnataka, laced the drinking water with Tritium, contaminating at least 90 employees. Death of a nuclear scientist under mysterious circumstances at Kaiga in June 2009 has further raised the issue of security of personnel at the highly sensitive nuclear reactors of India, particularly those chosen to remain outside of the IAEA scrutiny. The discovery of clandestine radioactive material in Delhi only serves to highlight the poor state of affairs at the Atomic Energy Regulatory Board (AERB), the authority for controlling the security of radioactive material in India, say analysts.