Two Arab TV channels have broadcast an audiotape said to be from Osama Bin Laden in which he offers Europe a truce if it "stops attacking Muslims".
But in the tape, aired by al-Arabiya and al-Jazeera satellite channels, the voice said the initiative would not be extended to the US, Reuters reported.
The person on the tape also vowed to avenge Israel's killing of Hamas founder Sheikh Ahmed Yassin.
A European security source said the tape appeared to be authentic.
However, the source, speaking on condition of anonymity, said officials had not yet completed their evaluation.
The CIA in Washington said it was also still examining the tape.
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