Story highlights A couple thought their app was taking to them a touristy avenue in a city near Rio de Janiero

Instead, it took them onto a road of the same name in a slum; the woman was killed

The incident raises questions about the accuracy of GPS apps, security of areas around Rio

Rio de Janeiro, Brazil (CNN) The couple followed their Waze GPS app, thinking it would lead them to a touristy avenue in Niteroi, a large city across the bay from Rio de Janeiro.

Instead, it led them to another street of the same name in Niteroi in one of the city's most notorious slum areas. The woman was shot and killed.

Regina Murmura, 70, a travel agent who had been using the Waze app while traveling through Niteroi with her 69-year-old husband, Francisco, was killed on Saturday night, according to a Brazilian police spokesman. The couple's app led them on a small road in one of the city's most notorious favelas, or slum areas.

Someone opened fire, with 20 bullets hitting the couple's car, the police spokesman said. Authorities don't know why, though drug gangs are prevalent in the area.

Francisco Murmura managed to drive away. He was not hospitalized.

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