Computer programs called apps are helping people avoid violence in the streets of Rio de Janeiro, Brazil. Rio de Janeiro has an average of 15 gun battles every day. Innocent people often get caught up in the shootings. One of the latest security apps is called OTT. That is short for Onde Tem Tiroteio, which means “Where There is a Shootout” in Portuguese. The app collects reports of shootings and sends the information to its users through social media services, such as Instagram, Twitter, Facebook, Telegram and Zello. Henrique Coelho Caamao provides technical support for OTT. He told the Reuters news agency “I keep saying, I don’t want a million ‘likes.’ I only want to save lives.” His group says its news alerts reach nearly 3 million people. That number represents almost half the population of Rio de Janeiro.