Thai police arrested 259 people on an island off the southern province of Ranong Saturday, days after activists reported a surge in the number of stateless Rohingya Muslims fleeing Myanmar's restive Rakhine state.
"We're seeking details from the authorities and appealing for them not to deport the group to a place where their lives or freedom could be threatened," said Vivian Tan, a spokeswoman for the UN refugee agency (UNHCR) in Bangkok.