What to know about the US arrest of a Peruvian gang leader suspected of killing 23 people

A South American crime boss wanted in the killings of at least 23 people in Peru was captured this week in New York, three months after U.S. immigration authorities arrested and then released him after he illegally entered the country at the Texas-Mexico border.

The arrests Wednesday of Gianfranco Torres-Navarro and his girlfriend, Mishelle Sol Ivanna Ortíz Ubillús, ended an international search that gripped Peru in the wake of violence attributed to Torres-Navarro and his “Los Killers” gang. Their capture also raised questions about why the notorious gang leader was allowed to stay in the U.S. after his initial brush with immigration authorities in May.