Tens of thousands of Roman Catholics greet Pope Francis in Rio de Janeiro, Brazil, during his first foreign trip as pontiff.
Two former military police officers are arrested in Brazil for the murders of Marielle Franco and her driver Anderson Gomes. One of the suspects was arrested at home, in a Rio de Janeiro gated community where President Jair Bolsonaro also resides. Franco was born in a Rio favela and became a politician and activist against violence in the slums, which are often controlled by paramilitary groups. Her assassination prompted widespread protests. [https:--www.theguardian.com-world-2019-mar-12-police-officers-arrested-murder-brazilian-politician-marielle-franco ("The Guardian)"]
More than 150 prominent scientists worldwide send a letter to World Health Organization Director-General Margaret Chan calling for the postponement or relocation of the Rio de Janeiro 2016 Summer Olympics because of the widening Zika virus outbreak in Brazil, despite U.S. Centers for Disease Control and Prevention Director Tom Frieden's statement yesterday that "there is no public health reason to cancel or delay the Olympics."
In Brazil, Cardinal Stanislaw Rylko, president of the Pontifical Council for the Laity, speaks to a group of World Youth Day delegates from 75 countries and 40 movements. He hopes World Youth Day 2013 in Rio de Janeiro will have a lasting effect on the hundreds of thousands of young people slated to attend.