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He also praised FARC’s fighters as heroes of the downtrodden in the struggle for social justice, but repeated the movement’s request for forgiveness for the war. “I apologize … for all the pain that we have caused,” he said.

The signing was greeted by wild cheers by about 1,000 FARC rebels in Sabanas del Yari, where the group recently concluded its last congress by endorsing the peace deal. “Yes, we can; yes, we can; yes, we can,” they shouted, followed by calls for Timochenko to be president.

“Let no one doubt that we are going into politics without weapons,” Londono said in his speech after the signing. “We are going to comply (with the accord) and we hope that the government complies,” he added.

Earlier in the day, Santos and foreign dignitaries attended a Mass celebrated by Cardinal Pietro Parolin, the Vatican’s secretary of state, at a baroque church named for St. Peter Claver, a 17th century Jesuit priest revered as the “slave of slaves” for his role aiding tens of thousands of African slaves brought to the New World as chattel.

In a stirring homily, Pope Francis’ envoy praised Colombians for overcoming the pain of the bloody conflict to find common ground with the rebels.

“All of us here today are conscious of the fact we’re at the end of a negotiation, but also the beginning of a still open process of change that requires the contribution and respect of all Colombians,” the cardinal said.

Across the country Colombians marked the occasion with a host of activities, from peace concerts by top-name artists to a street party in the capital, Bogota, where the signing ceremony was to be broadcast live on a giant screen. It was also celebrated by hundreds of guerrillas gathered in a remote region of southern Colombia where last week top commanders ratified the accord in what they said would be their last conference as a guerrilla army.