A first aid volunteer from the Central University of Venezuela, part of a group known as the Green Cross, shows a marble extracted from the chest of a demonstrator who was shot by anti-riot police during an anti-government rally in Las Mercedes, Caracas.

A first aid volunteer from the Central University of Venezuela, part of a group known as the Green Cross, shows a marble extracted from the chest of a demonstrator who was shot by anti-riot police during an anti-government rally in Las Mercedes, Caracas, June 19, 2017. © 2017 Giovanna Mascetti