The Ontario Provincial Police raided government offices last month as part of the probe into deleted e-mails and destroyed government records in the Liberals' billion-dollar gas-plant scandal.

Officers descended on the government's cybersecurity branch, in the former Sears building at 222 Jarvis St. in Toronto, on Nov. 27 looking for e-mails from two top aides to former premier Dalton McGuinty.

A search warrant says police wanted the e-mail inboxes of David Livingston, Mr. McGuinty's last chief of staff, and Laura Miller, Mr. Livingston's deputy. They were also looking for backup tapes of those e-mails, which would record the information in case the e-mails were deleted. The warrant indicates police were particularly interested in e-mails from the fall of 2012, dated Sept. 24, Oct. 29 and Nov. 26.

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OPP Sergeant Peter Leon confirmed the warrant was executed, but said he could not release further details. Community Safety Minister Yasir Naqvi said he learned of the raid last week.

Police are investigating Mr. Livingston for a possible criminal breach of trust. They allege Mr. Livingston brought in outside IT expert Peter Faist to wipe clean government hard drives in the dying days of Mr. McGuinty's premiership. Mr. Faist is Ms. Miller's boyfriend.

Mr. Livingston, through his lawyer, has maintained his innocence. None of Mr. McGuinty, Ms. Miller nor Mr. Faist is under investigation.

The document deletions came to light when a legislative committee investigating the Liberals' $1-billion cancellation of two gas-fired power plants asked for the records, only to be told some e-mails from Mr. McGuinty's office had been erased.

The Liberals then shut down the committee's attempt to call Mr. Faist and Ms. Miller to ask them about the allegations. The committee is now writing a final report on the cancellations.

Deputy Premier Deb Matthews on Thursday denied the government was trying to protect itself by putting a stop to the committee's investigation.

"There's a time when good things come to an end. It's time for that to wrap up," she said. "We're done."

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Progressive Conservative MPP John Yakabuski said he is worried the Liberal-dominated committee will whitewash the scandal in its report.