mandra greece greeks voice despair disbelief thursday flash flood kill least 15 people leave hundreds homeless many blame system allow house build dry river bed towns nea peramos mandra west capital athens crumple cars mangle furniture lay roads coat thick mud leave behind rag torrent smash home wednesday morning ruin tavern house go say paraskevas stamou restaurant owner mandra everything go road go water still flow flood last night morning expect another downpour tonight like god hat us tell reuters escape lethal floodwaters residents take desperate measure nowhere sleep sleep roof find carpet cover say man mandra whose house gutted flood remain stand sob mother add everything go anyone help us help anyone elderly people wander streets muddy clothe look bewilder concern indifference one side say take courage want anything else nothing say mandra resident maria kriada anyone ask water drink food eat somewhere sleep one come say bad weather continue thursday officials say wait condition improve give clear picture damage five people still miss flag fly half-mast state build acropolis thursday government declare three days national mourn newspapers express anger crime headline ta nea daily superimpose picture woman comfort next overturn car deeds man write leftist avgi refer unlicensed constructions experts blame haphazard construction natural path water runoff obstruct soil erosion mountain range hit fire towns build along old motorway link athens peloponnese city corinth build creep close road stream would drain runoff nearby pateras mountains block course state prepare ... compete nature say christos zeferos head research center atmospheric physics climatology academy athens add climate change mean people expect weather-related disasters prepare frequent different phenomena tell reuters many victims elderly young 36-year old truck driver call mother floodwaters rise around lorry line go dead soon afterwards greeks mourn disbelief flood kill least 15