Colombia's President Juan Manuel Santos declared the country's 50-year conflict with the FARC guerrilla group "truly over" Tuesday, with the disarming of the rebel group complete.

The UN-supervised process concluded with the delivery of the last truckloads of weapons from areas where the Revolutionary Armed Forces of Colombia (FARC) began demobilizing at the start of the year.

"With the laying down of arms ... the conflict is truly over and a new phase begins in the life of our nation," Santos said at a ceremony in Pondores, a remote area in the northern Guajira department.