TORONTO - An Ontario government IT expert testifying before a legislative committee probing the gas plants scandal says a computer hard drive was seized last August in an office building in Ottawa.

Police have alleged that up to 24 hard drives in the premier's office in the legislature may have been wiped with an all-access password obtained by former premier Dalton McGuinty's chief of staff.

They've seized government hard drives in Toronto in their investigation of the possible deletion of documents related to the cancellation of two gas plants that could cost up to $1.1 billion.

Government cyber security expert Shawn Truax says another hard drive, which was accessed with the same password, was seized from an office on Elgin Street in Ottawa.

He says it was a government satellite office which, according to a government directory, is occupied by the Ministry of Economic Development, Trade and Employment.

None of the allegations have been tested in court and a lawyer for David Livingston, who police are investigating for possible breach of trust, has denied that his client did anything wrong.