(RECORDING) The tape was provided by an American-based firm IntelCenter,which monitors terrorist propaganda.

VOA: standard.2009.09.14

Meanwhile,IntelCenter,a U.S.-based terrorism monitoring group that works with the U.S.government, warns the Christmas day attack could be just the start, and that the possibility of additional attempts on U.S.airplanes can not be ruled out.

VOA: standard.2009.12.26