Colombia's government and leftist rebels say they will sign a modified peace agreement on Thursday despite strong resistance from former President Alvaro Uribe.

The signing ceremony promises to be a more subdued event than the heavily symbolic one attended by several heads of state in September in the colonial city of Cartagena. Reflecting the more somber mood in the country after the original deal was narrowly rejected by voters in a referendum, it will be held at the tiny Colon theatre in downtown Bogota.