Hundreds of Pakistani youths flew kites from rooftops in the garrison city of Rawalpindi on Friday, celebrating an ancient colourful festival despite a ban imposed by authorities in 2007 following a spate of accidents.Enthusiasts have in the past used acid-soaked string and piano wire in kite-fighting battles, causing terrible injuries to people caught by tangles across roads – including slitting the throats of motorcyclists.Victorious participants and their supporters firing into the air can…