More than 1,400 Rohingya Muslim refugees were relocated to a remote island in the Bay of Bengal on Saturday, despite opposition from human rights groups concerned about the site's vulnerability to storms and flooding.

Including a similar sized group who were moved on Friday, it brings to around 6,700 the number of Rohingya refugees that Bangladesh has moved to the island of Bhasan Char since December.

Bangladesh says the relocation is voluntary, but some of the first group of refugees who were relocated spoke of being coerced. The government also says overcrowding in refugee camps in the Cox's Bazar district fuels crime.