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ST. LOUIS — Police said Wednesday that they had someone in custody in connection with the investigation of the fatal shooting of 7-year-old Xavier Usanga on Monday.

Asked by the Post-Dispatch about an arrest in the case, police declined to provide more information, saying the investigation was continuing.

Xavier was fatally shot and an 18-year-old male standing nearby was injured in the backyard of the Usangas’ home, in the 3500 block of North 14th Street.

Xavier is at least the 10th child killed in a shooting in St. Louis this year.

Neighbors said they were afraid Tuesday, and officials complained that witnesses were not coming forward.

This is a breaking news story and will be updated.

Robert Patrick is a reporter for the St. Louis Post-Dispatch.