A PHNOM Penh Municipal prosecutor on Tuesday said an Australian man arrested last week at the request of the Australian embassy for suspected child pornography offences in his home country is to be detained pending extradition.

Deputy Prosecutor Sok Kalyan said the man, Robbie Neils Derry, 53, was arrested Sunday after a request by the Australian embassy was submitted to Cambodia's Ministry of Foreign Affairs and a warrant was issued through the Court of Appeal by the Ministry of Justice to municipal authorities.

"I received the arrest warrant last week and then passed it to the general commissionaire of police to be enforced under the authority of the Appeal Court's general prosecutor," Sok Kalyan said.

He added: "[Derry] ... is detained temporarily in PJ prison and awaiting extradition," a process Sok Kalyan said could take up to two months as the two countries follow the formal procedures of their extradition agreement.