Tens of thousands of Colombians took to the streets to protest against the Revolutionary Armed Forces of Colombia, or FARC, after they executed four captives.

The victims, military soldiers kidnapped more than a decade ago, were shot at point blank when government troops attacked the FARC hideout.

Read by Emily Brass

Produced by Nikita Smith

Stories by Chris Hanna, Emily Brass, Joel Ashak, and Sarah Moore

New research shows that mountains under the Pacific Ocean are the site of one of Earth's most violent natural processes. Images taken by underwater sonars show that the massive volcanic mountains are being dragged into an abyss. 

The abyss is where the Pacific plate collides with the Indo-Australian plate. And it is up to 10.9km deep at some parts.

The expansion of the Guy-Concordia metro station is partly to blame for the increase in theft on Concordia's downtown campus.

Concordia's interim director of security Jacques Lachance said the new tunnels make it easier for thieves to flee the scene.

So far this year, more than 230 items were reported stolen to Concordia security. Their value is estimated at around $120,000. 

Read by: Joel Balsam

Stories by: Nikita Smith, Tara Brockwell, Aisha Samu and Niki Mohrdar

Produced by: Carlo Spiridigliozzi