SITTWE, Myanmar (AP) — Survivors of ethnic clashes in western Myanmar lashed out at the government Monday for failing to prevent violence between Muslims and Buddhists that has displaced more than 28,000 people over the last week.

The crisis, which first began in June, has raised international concern and posed one of the biggest challenges yet to Myanmar’s reformist President Thein Sein, who inherited power from a xenophobic military junta last year.