Indigenous boy, 15, murdered on Brazil's Amazon border

Erisvan Soares Guajajara's body was found with knife wounds in Maranhio region

A 15-year-old indigenous boy has been murdered in Brazil on the edge of a heavily deforested indigenous reserve in the state of Maranhio, on the fringes of the Amazon.

The murder, the fourth from the Guajajara tribe in recent weeks, came as a wave of racist abuse against indigenous people swept social media in the state.