The refugees fleeing Myanmar, from the Muslim Rohingya ethnic minority, have been persecuted for decades. They have been evicted from their homes and kicked off their land, and attacked by the military and by Buddhist extremists in Rakhine, the western coastal state where they live. Their voting rights were effectively revoked in February. Their government insists that they are in the country illegally, and most neighboring countries refuse to accept them.
In effect, they are stateless.
President Thein Sein denies that the Rohingya, with a population estimated at 800,000 or more, exist as an ethnic group, and he refers to them as Bengalis, suggesting that they are from Bangladesh and therefore subject to deportation.