Migrants on the Greek island of Kos have been tear-gassed and reportedly beaten as hundreds suffer sweltering conditions locked inside an open-air stadium without water, food or toilets. The main charity trying to deal with the crisis has accused authorities of "state abuse". Aid workers from Medecins sans Frontieres claim many families were told to stand "under the blaring sun" in temperatures of 32C (90F) for hours on end – in the hope of getting the paperwork they need to travel to Athens before heading to mainland Europe.