BELLEVILLE, Ont. -- A Canadian Armed Forces Sergeant posted at CFB Trenton in eastern Ontario has been found guilty of child pornography offences and arranging to commit a sexual offence against a child.

Crown Attorney Lee Burgess says David Rodwell was convicted in a Belleville, Ont., court on Thursday of possession of child pornography, making child pornography and making an agreement to commit a sexual offence against a child.

The 57-year-old air weapons systems technician was charged last year after participating in various online chat rooms, including a conversation with a U.S. Homeland Security special agent posing as an air force mother of three.

The conversation revolved around setting up a sexual encounter with a three-year-old child in San Francisco, and the investigation was turned over to the military police when information led to Rodwell's home at the base in Trenton.

Police also found five videos and 33 child pornography images on Rodwell's computer.

Burgess says sentencing is set for Dec. 15.