An activist takes part in a demonstration against the murder of journalists in Mexico, in Mexico City, Mexico on June 15, 2017. An icebox containing two unidentified severed heads and a threatening message was discovered outside a broadcaster's offices in Guadalajara. (Reuters/Edgard Garrido)
A group of journalists protest outside the National Palace in Mexico City, Mexico on June 28, 2017. The writing reads "S.O.S Press." Armed men dressed like police officers abducted Mexican photojournalist Edgar Daniel Esqueda Castro this morning. (Reuters/Carlos Jasso)

Icebox containing two heads found outside broadcaster in Mexico