Ashcroft called upon people worldwide to help ``identify, locate and incapacitate terrorists who are suspected of planning additional attacks against innocent civilians.''
"These men could be anywhere in the world,'' he said.
Ashcroft said five videotapes, shown without sound, had been recovered from the rubble of the home of Mohammad Atef, believed to have been Osama bin Laden's military chief. Officials say Atef was killed by a U.S. airstrike in November. The sound was left out to guard against the possibility that the messages contained signals for other terrorists.
Ashcroft said the videotapes ``depict young men delivering what appear to be martyrdom messages from suicide terrorists.'' He added that an analysis of the audio suggests ``the men may be trained and prepared to commit future suicide terrorist acts.''
He said the government had tentatively identified four of the five men depicted in the video as: Abd Al-Rahim, Muhammad Sa'id Ali Hasan, Khalid Ibn Muhammad Al-Juhani and Ramzi Binalshibh. Ashcroft said not much is known about any of them except Binalshibh, a Yemeni whom officials allege was an associate of the Sept. 11 suicide hijacker Mohammed Atta.
In the indictment handed down in December against Zacarias Moussaoui, Binalshibh was named along with Atta and the 18 other hijackers as an unindicted co-conspirator.
At a news conference, Ashcroft showed 30-second videos of Hasan, Al-Rahim and Al-Juhani.
Ashcroft said investigators were still translating the tapes; a decision about releasing the sound or a translation would be made after weighing security concerns, he said, adding that the department may decide not to release the sound.
``The portions we released today we felt were safe for release and we didn't believe they contained any surreptitious messages or coded signals that would be designed to alert parts of the terrorist network,'' Ashcroft said.