Brazilian Schools Under Siege: Second school shooting or mass casualty attack occurs in Brazil within 30 days

76%

probability · 34% confidence · 30 days

Brazilian school shooting confirmed: 2 killed, 13-year-old arrested in São Paulo. Existing forecast predicted second school shooting within 30 days at 68% probability. One event occurred; risk of second attack within timeframe elevated given security response gaps and social trauma signals. Probability updated to 76%. Forecast resolved (news-checked 2026-11-05): Two weeks after the Rio Branco shooting, a 23-year-old attacked a teacher and a classmate with knives and a hammer on May 19, 2026, during an exam held at a municipal school in Tapiratiba, Sao Paulo state.

Brunu publishes AI-generated probability forecasts on world events, markets, and policy. Forecasts update as new signals come in and are graded correct/incorrect at close — full track record at brunu.ai/forecasts. Informational only. Not financial, legal, or medical advice.