The Greek Prime Minister, Alexis Tsipras, has declared a period of national mourning after flash floods killed 15 people. Another 37 people were taken to the hospital and hundreds of homes have been destroyed. Caitlin McGee reports. Subscribe: http://trt.world/subscribe Livestream: http://trt.world/ytlive Facebook: http://trt.world/facebook Twitter: http://trt.world/twitter Instagram: http://trt.world/instagram Visit our website: http://trt.world