An audio tape attributed to al Qaeda's deputy leader urged Muslims on Friday to organise resistance against "crusader America" and its allies throughout the world.
"We should not wait until US, British, French, Jewish, South Korean, Hungarian or Polish forces enter Egypt, the Arabian Peninsula, Yemen and Algeria before we resist," said the tape, attributed to Ayman al-Zawahri, Osama bin Laden's lieutenant.
"We can't wait or we will be eaten up country by country ... People of knowledge and experience should organise their efforts and form a leadership for the resistance to combat the crusaders."
The tape, aired by Al Jazeera television, said resistance should carry on if al Qaeda leaders were killed or arrested.
"Let us start resisting now. The interests of America, Britain, Australia, France, Poland, Norway, South Korea and Japan are spread everywhere. They all took part in the invasion of Afghanistan, Iraq or Chechnya or enabled Israel to survive."
The speaker said Muslim youths should emulate insurgents in Iraq, where guerrillas are fighting US forces and the US-backed government, and in Afghanistan, where guerrillas loyal to the ousted Taleban government are stepping up violence ahead of next month's presidential election.
It called for attacks against Israel and its ally, the United States, to support the Palestinian uprising against Israeli occupation.
"Defending Palestine is a legitimate issue and liberating Palestine is an Islamic duty for all, therefore Muslims cannot give up Palestine even if the whole world does so," the voice said.
"Limiting the battle to fighting only the Jews in Palestine, and leaving America without attacking it, will not restrain America and the crusaders against us."
US officials said they were analysing the tape to determine its authenticity. The voice sounded similar to previously recorded messages by him. It was not clear when the tape had been made.