In a burst of activity that ended 16 months of inaction, the House ethics committee on Wednesday opened investigations of a Republican and a Democrat who are subjects of federal bribery inquiries. One lawmaker is connected to convicted lobbyist Jack Abramoff.

Rep. Bob Ney, R-Ohio, who had strong ties to Abramoff and accepted favors from him, will be investigated along with Rep. William Jefferson, D-La. A former aide to Ney pleaded guilty last week, admitting he tried to corrupt the congressman. Two businessmen have pleaded guilty to bribing Jefferson.

The committee also will conduct a preliminary inquiry into whether other lawmakers were involved in a bribery scandal that led to the conviction of former Rep. Randy "Duke" Cunningham, R-Calif. He is now serving an eight-year sentence in federal prison.

In a separate announcement, the committee said it would have investigated overseas travel by former House Majority Leader Tom DeLay, but will not do so because the Texas Republican soon is leaving Congress. The committee does not have jurisdiction over lawmakers once they leave.

Ney said he welcomed the investigation.

"For the last 15 months, all I have asked for is an opportunity to have the facts surrounding the Abramoff matter to be reviewed by the appropriate investigative bodies in order to have this matter addressed once and for all," Ney said in a statement.

He has stepped aside as chairman of the House Administration Committee because of an investigation by the Justice Department.

Jefferson's office had no immediate comment; the lawmaker has previously denied wrongdoing.

The simultaneous investigations of Ney and Jefferson give a bipartisan tone at a time when Democrats are trying to make a campaign issue out of Republican misconduct.

The committee of five Republicans and five Democrats had been in a partisan deadlock since the beginning of last year. The House GOP leadership removed two GOP members of the committee and the Republican chairman after they had admonished DeLay for his conduct. Since then, the committee has fought over committee rules and staffing, and failed to get a sixth vote to begin any investigation.

In April, the committee's top Democrat, Rep. Alan Mollohan of West Virginia, stepped down from the committee after published reports questioned his role in steering federal money to nonprofit group led by his supporters. Mollohan had feuded constantly with the current chairman, Rep. Doc Hastings, R-Wash.

Replacing Mollohan was Rep. Howard Berman, D-Calif., who earlier was the committee's top Democrat. Berman had good relations with Republicans on the panel.

Ney's former top aide, Neil Volz, admitted he conspired to corrupt Ney, his staff and other members of Congress with trips, free tickets, meals, jobs for relatives and fundraising events.

Volz said he engaged in a conspiracy, the intent of which was "to influence members of Congress in violation of the law." He enumerated 16 actions he said his old boss took on behalf of Abramoff clients.

In addition, Volz wrote, Abramoff gave the congressman and his staff numerous tickets to concerts and sporting events in the Washington, D.C., area; regular meals and drinks at restaurants including Abramoff's restaurant Signatures and unreported use of Abramoff's box suites at the MCI Center Arena in Washington and Camden Yards Stadium in Baltimore for political fundraisers for Ney and for candidates and political organizations he supported.

As for Jefferson, a Louisville, Ky., man pleaded guilty in federal court this month to bribing the congressman with more than $400,000 in payments, company stock and a share of the profits to promote a Kentucky company's high-tech business ventures in Africa.

Vernon L. Jackson was the second person to plead guilty to charges of bribing the eight-term Democrat to promote iGate's Inc.'s broadband technology — in Nigeria, Ghana and Cameroon.

Hastings and Berman said investigators will look at allegations that Ney received gifts, travel benefits, campaign contributions and other items of value from Abramoff and his associates — and the relationship of any favors to Ney's legislative actions.

They said the Jefferson investigation will focus on whether the lawmaker or his family got cash, stock shares, agreements for future profits or other benefits from several individuals or iGate Inc. — and how any such favors affected his legislative actions.

The committee leaders cited serious allegations about DeLay's overseas trips. The Associated Press and other news organizations have reported that some travel was paid by Abramoff and his clients, despite House rules prohibiting lawmakers from accepting trips financed by lobbyists.

"But for his imminent resignation from the Congress ... we would have recommended to our colleagues on the committee the formation of an investigative subcommittee to conduct a formal inquiry into those allegations," Berman and Hastings said.

DeLay, who is under indictment in Texas on charges of campaign finance improprieties, said he is leaving Congress on June 9.

Cunningham's case has evolved into a wide federal investigation involving money, power and sex, with questions about whether other lawmakers were tied to the bribes by federal contractors.

The committee decided that "In light of those continuing reports and the seriousness of the potential rules violations," an investigation should get under way to determine whether other House members or employees were implicated in the scandal, the leaders said.