A global rights group cast doubt Friday on Bangladesh's claims that thousands of Rohingya refugees are ready to move to a new island site that critics say is prone to natural disasters.Dhaka has long wanted to move 100,000 people to the silt islet of Bhashan Char to relieve overcrowded mainland camps where almost a million Rohingya have lived since fleeing a brutal military crackdown in Myanmar in 2017.Bangladeshi officials have said that between 6,000 to 7,000 Rohingya have already expr