Activists in Burma say eight Rohingya Muslims were killed by police in fresh violence in Arakan state.
Details about the incident, which is said to have taken place last week near the town of Maungdaw, vary widely.
Reports say clashes erupted with police following the disappearance of a policeman at a Rohingya village.
The government of Burma (also known as Myanmar) said it had no information, but local authorities denied any killings took place.
Arakan state officials told the BBC that 84 Rohingya villagers had been arrested after an incident.
But the Arakan Project, an advocacy group that focuses on Rohingyas, said events reached their climax on 13 January in Du Char Yar Tan village with at least eight people killed and more feared dead.
Women and children are reported to be among the dead.