The police said that 10 prisoners asked to see the warden and complained about the transfer of prison matters, but the two sides mistime their marks. A prisoner threw grenades and caused an explosion.
警方说，这10名囚犯求见典狱长，申诉移监事宜，但双方话不投机，有囚犯投掷手榴弹，酿成爆炸事件。