The Daily Telegraph reported Monday it had learned the Europe-wide terrorism alert issued this past weekend was triggered by the disclosure by the informant, identified as German national Ahmad Sidiqi of Hamburg.
Sidiqi allegedly had told U.S. interrogators al-Qaida commander Ilyas Kashmiri had told him terror cells were already in Germany and Britain. Kashmiri allegedly had revealed the plot to Sidiqi during a campfire conversation, the British newspaper said.
Sidiqi was captured by American forces in July and has been interrogated at Bagram in Afghanistan.
Security sources in the United States and Europe told the Telegraph no targets or attack timetables were discussed. No suspects tied to terror cells had been found.
Kashmiri is allegedly one of the men behind the 2008 attacks on Mumbai that left 174 people dead.