An asylum seeker has been hit by a rock during violent scenes at the Manus Island Detention Centre.
Papua New Guinea Defence Force personnel fired shots into the air, with detainees saying at least 100 rounds were fired during the incident.
Australian staff reportedly ran for cover after locking the gates.
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Some sheltered inside the centre with asylum seekers while others were seen running for a boat moored nearby.
The ABC reports the shooting may have been a response to an earlier fight between asylum seekers and PNG Defence Force personnel from the adjacent Lombrum Naval Base.