Prime Minister Shehbaz Sharif calls the flooding in Pakistan "the worst in the country's history", during a media briefing in Islamabad, as aid efforts ramped up across the country to help tens of millions of people affected by relentless monsoon rains that have submerged a third of the country and claimed more than 1,100 lives. Sharif tells reporter that it would cost at least $10 billion to repair damaged infrastructure spread across the country. IMAGES AND SOUNDBITES