The two-day Pakistan-India talks on terrorism and drug trafficking begin in Islamabad Tuesday as part of the composite dialogue process between the two South Asian neighbours, officials said. Indian Home Secretary Dhirendra Singh will lead the Indian side while Interior Secretary Tariq Mehmood Pakistan's delegation at the talks. Officials said Mehmood would impress upon his Indian counterpart to define terrorism. Pakistan and India are in direct conflict over the issue for the last two decades as Pakistan views freedom struggle of the people of Kashmir legitimate while India holds the opposite view. Official said the Indian home secretary would also call on Interior Minister Makhdoom Faisal Saleh Hayat. Meanwhile, the two-day secretary level talks between Pakistan and India on bilateral trade begin in Islamabad on August 11. Indian Commerce Secretary Deepak Chatterjee will lead the Indian delegation. Pakistan's side will be led by Commerce Secretary Tasneem Noorani. Officials said the two sides will discuss the promotion of bilateral trade, free trade, free import and export of agricultural products, industrial growth, sea trade, Pakistan-Iran-India gas pipeline and an end to tariff and non-tariff barriers.