Rescuers are calling for more body bags to be sent to a Libyan city hit by catastrophic flooding - as fears of waterborne diseases grow.More than 11,300 people are known to have died - and this could reach up to 20,000, with a further 10,100 missing.Meanwhile, attempts to coordinate humanitarian aid have been hampered by Libya's fractured government - caused by years of political instability and civil unrest.Today on Sky News Daily, Niall Paterson speaks with Sky News Africa correspondent Yousra Elbagir from the port city of Derna, which was devastated when two dams collapsed, unleashing a tsunami that washed entire city blocks into the Mediterranean Sea.Sky News special correspondent Alex Crawford also joins Niall from Derna, as rescue teams scramble to find survivors in the rubble.This podcast contains graphic descriptions.Podcast Producer: Soila ApparicioPromotions Producer: David ChipakupakuEditor: Adam Jay