Many of the hillsides were cleared of trees to make way for shelters, leaving the land highly unstable. There are fears heavy flooding could also overflow latrines and spread disease in the close confines of the camps, where around 700,000 Rohingya Muslims have arrived from Myanmar since August. 'If a big storm hits the camps, it would be nothing short of disastrous,' she said. Save the Children spokesman Daphnee Cook said Thursday's rain had already 'wreaked havoc' but the monsoon proper posed a much greater threat.