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The Bush administration built an unprecedented surveillance operation to pull in mountains of information far beyond the warrantless wiretapping previously acknowledged, a team of federal inspectors general reported Friday, questioning the legal basis for the effort but shielding almost all details on grounds they're still too secret to reveal.

The report, compiled by five inspectors general, refers to "unprecedented collection activities" by U.S. intelligence agencies under an executive order signed by President George W. Bush after the Sept. 11, 2001, terror attacks.

Just what those activities involved remains classified, but the I.G.s pointedly say that any continued use of the secret programs must be "carefully monitored."

The report says too few relevant officials knew of the size and depth of the program, let alone signed off on it. They particularly criticize John Yoo, a deputy assistant attorney general who wrote legal memos undergirding the policy. His boss, Attorney General John Ashcroft, was not aware until March 2004 of the exact nature of the intelligence operations beyond wiretapping that he had been approving for the previous two and a half years, the report says.

Most of the intelligence leads generated under what was known as the "President's Surveillance Program" did not have any connection to terrorism, the report said. But FBI agents told the authors that the "mere possibility of the leads producing useful information made investigating the leads worthwhile."

The inspectors general interviewed more than 200 people inside and outside the government, but five former Bush administration officials refused to be questioned. They were Ashcroft, Yoo, former CIA Director George Tenet, former White House Chief of Staff Andrew Card and David Addington, an aide to former Vice President Dick Cheney.

According to the report, Addington could personally decide who in the administration was "read into" -- allowed access to -- the classified program.

The only piece of the intelligence-gathering operation acknowledged by the Bush White House was the wiretapping-without-warrants effort. The administration admitted in 2005 that it had allowed the National Security Agency to intercept international communications that passed through U.S. cables without seeking court orders.

Although the report documents Bush administration policies, its fallout could be a problem for the Obama administration if it inherited any or all of the still-classified operations.

Bush started the warrantless wiretapping program under the authority of a secret court in 2006, and Congress authorized most of the intercepts in a 2008 electronic surveillance law. The fate of the remaining and still classified aspects of the wider surveillance program is not clear from the report.

The I.G. report said that President Bush signed off on both the warrantless wiretapping and other top-secret operations shortly after Sept. 11 in a single presidential authorization. All the programs were periodically reauthorized, but except for the acknowledged wiretapping, they "remain highly classified."

The report says it's unclear how much valuable intelligence the program has yielded.

The report, mandated by Congress last year, was delivered to lawmakers Friday.

Rep. Jane Harman, D-Calif., said she was shocked to learn of the existence of other classified programs beyond the warrantless wiretapping.

Former Bush Attorney General Alberto Gonzales made a terse reference to other classified programs in an August 2007 letter to Congress. But Harman said that when she had asked Gonzales two years earlier if the government was conducting any other undisclosed intelligence activities, he denied it.

Robert Bork Jr., Gonzales' spokesman, said, "It has clearly been determined that he did not intend to mislead anyone."

Senate Judiciary Committee Chairman Sen. Patrick Leahy, D-Vt, renewed his call Friday for a formal nonpartisan inquiry into the government's information-gathering programs.

CIA director eliminates covert program

CIA Director Leon Panetta has terminated a "very serious" covert program the spy agency kept secret from Congress for eight years, Rep. Jan Schakowsky, a House Intelligence subcommittee chairwoman, said Friday. Schakowsky is pressing for an immediate committee investigation of the classified program, which has not been described publicly. Rep. Silvestre Reyes, D-Texas, the chairman of the House Intelligence Committee, has said he is considering an investigation.