https://www.scientificamerican.com/article/what-the-protests-and-violence-in-chile-mean-for-science2/

A few seconds after a tear-gas canister burst near Marcelo Jaque’s feet, breathing became nearly impossible. Jaque, an astronomer at the University of La Serena in Chile, ran with his partner to safety as fellow protesters began choking and vomiting or fell unconscious. What moments earlier had been a peaceful demonstration dissolved into chaos as police forces tried to disperse the crowd.

The demonstration in La Serena on 21 October was part of a nationwide upheaval that started three days earlier owing to a metro fare hike in Santiago, Chile’s capital, which sparked mass demonstrations across the country. The increase of 30 Chilean pesos (US$0.04) was the last straw for people fed up with decades of socio-economic inequality and government corruption. Protesters point to tax-fraud scandals, the soaring cost of education and health care, and the lack of dignity with which they say minority groups have been treated as examples of the ongoing problems.