NEW DELHI - Pakistans nuclear programme that focuses on 'low-yield, tactical nuclear weapons that could possibly be used at the border has India worried, The Times of India reported on Thursday. Citing Indian security and intelligence officials, Pakistans fourth reactor at the Khushab military facility suggests that the country has the capability to add at least eight to 10 such weapons each year. They are following the Chinese model of having low-yield nuclear weapons. Pakistan believes these weapons will provide it a flexible response in case of an escalation with India and allow it to dominate, SD Pradhan, former chief of joint intelligence committee, told the newspaper. Pradahan, who has closely followed Pakistans nuclear programme, further stated that Pakistans desire for such weapons is one of the main reasons for the acceleration of its nuclear programme. And according to The Times, the figure of eight to 10 weapons is expected to go up once the new reactor becomes operational in two years. Satellite images revealed by Newsweek indicate an aggressive build-up at the plutonium producing facility. According to The Times of India, Pakistan is known to have a nuclear arsenal but the current focus on low-yield weapons has India worried. Indian officials and experts believe, according to the newspaper, that these weapons will be used by Pakistan in case of an incursion made by Indian forces into Pakistani territory. In case of a repeat of the Mumbai attacks, there will be pressure on the Indian government to mount such an incursion and strike some of the terror camps.