The United Nations confirmed that the Revolutionary Armed Forces of Colombia delivered 7,132 weapons, as part of the peace process to end decades of armed conflict and to start its transition into political life.
The mission on Monday said it stored FARC weapons in 26 "reincorporation zones" in which FARC members are housed during an effort to transition the militants into civilian life.
The rebels were supposed to have turned in all of their weapons by the end of May under the original terms of the peace deal signed past year to end Colombia's long-running conflict, but there have been numerous delays.
Santos, who took office in 2010, began secret talks with FARC commanders that led to negotiations in Cuba and a final peace accord late a year ago.
Since then, the process has been blighted by ongoing violence involving other armed groups.
"This is a peace that allows better education, health, housing and more opportunities for Colombians", Colombian President Juan Manuel Santos wrote on Twitter on Tuesday, launching the hashtag "Viva La Vida", meaning "live life" in English, to celebrate a new chapter of Colombia's history.
The Revolutionary Armed Forces of Colombia, known as FARC, turned in the remaining 40 percent of their firearms in Mesetas, a mountainous area in southeastern Colombia.
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That excluded some arms that were exempted for transitional security at rebel demobilization camps until August 1.
Courts: Those accused of crimes in the conflict will go before special courts and could get reduced sentences if they confess. Nearly every guerrilla at the Mariana Paez camp recalled the decade-long bloodletting that followed a previous attempt at peace in the 1980s, when as many 3,000 members of a FARC-aligned political party were gunned down by right-wing paramilitary assassins, sometimes in cahoots with state intelligence services.
The conflict has left at least 260,000 people dead, more than 60,000 missing and seven million displaced. The FARC has pledged to use its assets to compensate victims.
Three women were killed at a shopping center in Bogota on June 17, in a bombing blamed on a fringe extremist group.
The accord promises land and credit lines for rural communities, with millions of dollars of investment. But many conservative critics worry the FARC are hiding many more weapons.