Police are hunting for an escapee from the Goulburn Correctional Centre in the NSW southern tablelands and have warned the public not to approach him.
Police said Christopher Gibbs, 30, was last seen at the minimum-security centre on Maud Street at 8.35am (AEDT) on Tuesday, but he was not seen at a 9.30am muster.
Gibbs has been serving a sentence of seven years and eight months for armed robbery and other robbery offences and has been in custody for 14 months.
He is described as being of Caucasian appearance, 195cm tall, of a thin build, with sandy blond hair and acne scars on his face.
He was last seen wearing prison greens.
He is known to have associates in the St Marys area in Sydney's west.
Anyone who sees Gibbs is urged not to approach him but contact police immediately on triple-zero.