This is what I found: FINRA determines that an
Post# of 41413
FINRA determines that an extraordinary event has occurred or is ongoing that has had a material effect on the market for the OTC Equity Security or the security underlying an OTC ADR or has caused or has the potential to cause major disruption to the marketplace and/or significant uncertainty in the settlement and clearance process ("Extraordinary Event Halt" .
http://www.finra.org/industry/orf/orf-trading-halts