This excerpt taken from the LUX 20-F filed Jun 28, 2006.
Market Disruption Event means:
(i) at or about noon on the Quotation Day for the relevant Interest Period the Screen Rate is not available and none or only one of the Reference Banks supplies a rate to the Agent to determine EURIBOR or, if applicable, LIBOR for the relevant currency and Interest Period; or
(ii) before close of business in Milan on the Quotation day for the relevant Interest Period, the Agent receives notifications from a Lender or Lenders (whose participations in a Loan exceed 60 per cent. of that Loan) that the cost to it of obtaining matching deposits in the Relevant Interbank Market would be in excess of EURIBOR or, if applicable, LIBOR.