CAIRO, Egypt (AP) – An American member of Al Qaeda warned President Bush on Tuesday to end American involvement in all Muslim lands or face an attack worse than the Sept. 11 suicide assault, according to a new videotape.

Wearing a white robe and a turban, Adam Yehiye Gadahn, who also goes by the name Azzam al-Amriki, said Al Qaeda would not negotiate on its demands.

“Your failure to heed our demands … means that you and your people will … experience things which will make you forget all about the horrors of September 11th, Afghanistan and Iraq and Virginia Tech,” he said in the seven-minute video. Mr. Gadahn, who appeared in an Al Qaeda video last September in which he called on Americans to convert to Islam, demanded that Bush remove all American military and spies from Islamic countries, free all Muslims from American prisons and end support for Israel. He said a withdrawal of American troops from Iraq alone would not satisify al-Qaida.

Ben Venzke at IntelCenter, an American government contractor that monitors Al Qaeda messages, said the group likely did not believe any of its demands would be met.

“It essentially allows Al Qaeda to say that it has provided fair warning and is thus no longer responsible for the outcome,” Venzke said in a statement.

Mr. Gadahn, a California native, is the first American to be charged with treason in more than 50 years and could face the death penalty if convicted. He also was indicted on a charge of providing material support to terrorists.