No additional changes will be filed in the widespread probe into corruption in the Pennsylvania Legislature until after the Nov. 4 election, Attorney General Tom Corbett said yesterday.

Earlier, Mr. Corbett had stated that he would suspend any further charges between Oct. 1 and the Nov. 4 election to avoid influencing the outcome of any races. All state House and half of state Senate seats are up for election this year, and the grand jury is known to be investigating several elected officials.

Grand jurors are scheduled to sit one more week between now and Mr. Corbett's self-imposed Oct. 1 deadline. There is no requirement under state law to withhold criminal charges within a month of a general election, but Mr. Corbett brought the practice with him after serving as United States attorney in Pittsburgh.

"I know this investigation very well. I know that my office cannot present the grand jury, in that one week, all of the testimony and other evidence that will be necessary to complete the next phase of the investigation," Mr. Corbett told a luncheon meeting of the Pennsylvania Press Club in Harrisburg yesterday.

Sources close to the probe have said that Mr. Corbett's office is focusing on potential wrongdoing surrounding a $1.8 million computer contract for the House Republican caucus as well as potential obstruction charges against Democratic caucus employees in connection with the destruction of records sought in a probe into taxpayer-funded bonuses given for political work.

Yesterday, several aides to former Republican Speaker of the House John Perzel, R-Philadelphia, were interviewed by prosecutors, according to a source close to the probe.

To date, the grand jury has issued presentments accusing a dozen current and former Democratic legislators or caucus employees of multiple counts of theft, conflict of interest and conspiracy. The accused include former House Minority Whip Michael Veon, D-Beaver, and current state Rep. Sean Ramaley, D-Beaver.

The investigation has brought charges of partisanship against Mr. Corbett, a Republican seeking re-election this year, because all of those charged to date have been Democrats.

"Those accusations are wrong," Mr. Corbett told the Press Club, "but I accept the fact that they are inevitable -- especially in an election year."

Mr. Corbett's announcement brought a strong response from John Morganelli, his Democratic opponent in the attorney general's race.

"I believe this investigation was botched right from the beginning," said Mr. Morganelli, the district attorney in Northampton County.

He said state prosecutors should have simultaneously demanded records from both the Republican and Democratic caucuses of both chambers of the General Assembly. At the time the investigation got under way, agents from the attorney general's office seized records from the House Democrats, saying they were slated for destruction.

Currently, investigators are known to have access to computer records and hard drives from computers used inside the House Republican caucus containing data from 2006 -- the year covered by the bonus probe, commonly called "Bonusgate."

The investigation quickly widened to cover areas not connected to the large bonuses given to House Democratic staff members who worked on the 2006 election campaigns.

Mr. Morganelli, who has charged that Mr. Corbett's investigation is politically tainted, said the strategy of investigating one caucus at a time gave Republicans "18 months to get their house in order."

"Only later he was trying to scrape together some kind of case against the Republicans and that hasn't materialized."