Authorities confirmed a Wednesday morning mass shooting took place at a Catholic parish and school 6 miles south of downtown Minneapolis in an affluent, family-friendly neighborhood.

The local crime-watch outlet Minnesota Crime said on Wednesday morning that police reported 20 victims of an “active shooter” at the site of Annunciation Church in Minneapolis, with emergency responders having initiated a “mass-casualty response.” Annunciation Catholic School is located next to the parish.