UN chief Ban Ki-moon said Monday he had "urgently" sent his Colombia envoy to Havana for talks after a peace deal with communist FARC rebels suffered a shock referendum defeat. 

"I have seen the results of yesterday's plebiscite. We would have hoped for a different result," the United Nations secretary general told reporters in Geneva. "I have urgently dispatched my special representative Mr. Jean Arnault to Havana to continue his consultations," Ban added. 

The pact to end Colombia's half-century civil war has been negotiated in the Cuban capital Havana.