Tens of thousands of Colombian took to the streets nationwide Sunday to denounce violence and express support for a deal to end the country's half-century conflict.

The "March for Life" was organized by former Bogota Mayor Antanas Mockus and was endorsed by President Juan Manuel Santos, who participated in the mobilization in the capital.

Santos' conservative opponents boycotted the event, saying it didn't live up to its non-partisan billing.

They point to a $200,000 government contract with a foundation led by Mockus to educate Colombians about ongoing peace talks with leftist rebels as evidence that the rally was being promoted by Santos.

The march drew support in cities around the country as well as from Colombians living in Paris, Beijing and other cities around the world.