US officials are analyzing a videotape of fugitive al-Qaida leader Osama bin Laden that was posted on the Internet on Sunday.
It was not immediately clear when or where the tape was made.
In the tape, bin Laden praises what he calls martyrdom and says the Prophet Muhammad wanted to be a martyr. The al-Qaida leader was shown for less than one minute of the 40-minute video that paid tribute to militants killed in Afghanistan.
On Friday, the US Senate voted to double the reward for information about bin Laden's to 50 million dollars. The move must still be approved by the House of Representatives and President Bush.
The Senate voted on the matter after reports that al-Qaida had rebuilt its strength and leadership, and is trying to sneak operatives in the United States.