Protesters set a tyre on fire as a road block during a demonstration against a water shortage in Karachi June 5, 2009. Hundreds of men took to the streets of Karachi to demonstrate against a water shortage in their neighbuorhood before clashing with police trying to clear their road bocks with the use of tear gas and gun shots. About a dozen people were injured during the clashes, witnesses said. REUTERS/Athar Hussain (PAKISTAN CONFLICT ENVIRONMENT)