A four-year-old child was killed during the latest round of protests in Chile, raising the death toll from five days of social unrest to 18.

Interior Under-Secretary Rodrigo Ubilla said today the child and an adult man were killed Tuesday when a drunk driver rammed into a crowd of protesters. A third person died from injuries sustained in a beating by police, according to the victim’s family.

Unrest in Santiago was triggered by an increase in metro fares but reflected much broader anger over economic and social conditions, including a yawning gap between the rich and the poor. The country is considered one of the most stable in Latin America.