Only audio tapes for a long, long time now. Why does Al Qaeda think it’s safe for Ayman al-Zawahri to appear on video but not the kingpin himself? Report: New bin Laden tape emerges.

(CNN) — A new audio tape allegedly from al Qaeda leader Osama bin Laden claims responsibility for an attempt to blow up a plane en route to Michigan on Christmas Day and warns the United States of more attacks.

The tape, which aired on the Arabic-language news Web site Al-Jazeera on Sunday, says “the United States will not dream of enjoying safety until we live it in reality in Palestine.”

The tape continues: “It is not fair to enjoy that kind of life while our brothers in Gaza live in the worst of miseries.” …

In another section of the audio tape that Al-Jazeera broadcast, the voice says: “God willing our attacks will continue as long as you support the Israelis and may peace be on those who follow guidance.”

Bin Laden also claims responsibility for the foiled attack on Delta flight 253 in December.

“The message intended to be sent to you was through the hero fighter Omar Farouq, may God release him, confirming an earlier message that the [September] 11th heroes delivered to you and it was repeated before and after [that event],” he says.