PORT-AU-PRINCE, Haiti — Efforts to help Haitians survive the gang violence ravaging their nation suffered a new blow with the kidnapping of an American nurse from New Hampshire and her young daughter, who remained missing Tuesday.

       Haiti’s gangs have grown in power since the July 7, 2021 assassination of President Jovenel Mo？se and are now estimated to control up to 80% of the capital. Hundreds of people have been reported kidnapped since January, a significant uptick from previous years. The surge in killings, rapes and kidnappings has led to a violent uprising by civilian vigilante groups.

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       Around 200 Haitians had marched in their nation’s capital to show their anger over the abduction of Alix Dorsainvil, who was working for nonprofit Christian ministry El Roi Haiti when she and the girl were seized Thursday. The kidnapped woman is the wife of El Roi Haiti’s founder Sandro Dorsainvil.