"Our committee was not informed, has not been kept informed, and we are very frustrated about that issue," said the committee's Democratic chairman, Rep. Sylvestre Reyes, after a three-hour private meeting with the CIA's director, Air Force Gen. Michael Hayden. That meeting, he said, "is just the first step in what we feel is going to be a long-term investigation."
The probe will include calling other witnesses, including Hayden predecessors George Tenet and Porter Goss, and John Negroponte, the former Director of National Intelligence who is now the deputy secretary of state, said Rep. Peter Hoekstra, the committee's senior Republican.
Reyes told CBS News that Hayden told the committee that he never received a sit-down briefing from Goss when he became CIA director.
Hoekstra told CBS News that he and Reyes both agree the man they most want to hear from is Jose Rodriguez, the former CIA director of operations, who ordered the destruction of the tapes. He said a meeting could happen relatively soon, possibly before Christmas.
Both also said they want to hear from former White House counsel Harriet Miers.
Hayden acknowledged that "particularly at the time of the destruction, we could have done an awful lot better at keeping the committee alerted and informed."
Hayden said he learned of the terrorist interrogation videotapes more than a year ago in his tenure as principal deputy director of national intelligence, where he served from April 2005 to May 2006. He said he did not know that the tapes were being destroyed.
"I did not personally know before they were destroyed, not at all," he said after the briefing. "I was aware of the existence of the tapes but really didn't become focused on it until the summer of '06."
Reyes said some members were "stunned" by what they heard at Wednesday's meeting, but they will need many more hearings before being able to figure out exactly what happened, reports CBS News correspondent Bob Fuss.
Hoekstra said the panel also will look into the White House's interrogation policy and whether the intelligence agency's interrogators followed it.
Hayden made a similar appearance before the Senate Intelligence Committee on Tuesday, but said he could not answer all the panel's questions because the tapes were created and destroyed before he arrived at the CIA, under the tenure of his predecessors Tenet and Goss.
"Other people in the agency know about this far better than I," Hayden said, and promised the committee he would make those witnesses available.
Hayden told CIA employees last week that the videotapes, made in 2002, showed the CIA's interrogations of two terror suspects. The CIA destroyed the tapes in 2005. The tapes were made to document how CIA officers were using new, harsh questioning techniques recently approved by the White House to force recalcitrant prisoners to talk.
They show the interrogations of Abu Zubaydah and Abd al-Rahim al-Nashiri.
Abu Zubaydah, the first high-value detainee taken by the CIA in 2002, is now being held with other detainees at the U.S. base at Guantanamo Bay, Cuba. He told his interrogators about alleged 9/11 accomplice Ramzi Binalshibh, and the two men's confessions also led to the capture of Khalid Sheikh Mohammed, who the U.S. government said was the mastermind behind the Sept. 11 terrorist attacks.
Al-Nashiri is the alleged coordinator of the 2000 suicide attack on the USS Cole in Yemen, which killed 17 sailors. He is also now at Guantanamo.
The CIA has not described exactly what was shown on all the tapes. However, among the harsh interrogation techniques the White House approved in 2002 was waterboarding.
Waterboarding involves strapping down a prisoner, covering his mouth with plastic or cloth and pouring water over his face. The prisoner quickly begins to inhale water, causing the sensation of drowning.
The CIA is known to have waterboarded three prisoners - Abu Zubaydah, Al-Nashiri and Khalid Sheikh Mohammed.
The CIA has not used the technique since 2003, according to a government official familiar with the program. Hayden prohibited waterboarding in 2006. The U.S. military outlawed it the same year.
The CIA destroyed the videotapes in November of 2005. Exactly when Congress was notified of that and in what detail is in dispute.
President Bush said he didn't know about the tapes or their destruction until last week.