"Another group of 200 Rohingya have been rescued off the coast of Sumatra. They tell of mis-treatment at the hands of the Thai military, with 22 dying on board their boat which was set adrift for three weeks without food or supplies. Many are now receiving medical treatment for severe dehydration. Some are in critical condition. Many have sighn of injuries on their bodies. Al Jazeera's Step Vaessen has this report."