CNN —At least 20 people were injured and one person has died in a shooting overnight, according to police, in what witnesses say was a Juneteenth celebration turned deadly. Some of the injured were transported to hospitals by ambulance and others walked in, DuPage County Deputy Sheriff Eric Swanson told reporters Sunday. Witnesses say the shooting took place around 12:30 a.m. in a parking lot in Willowbrook, about 21 miles west of Chicago. The motive behind the shooting is unclear and it is still an active investigation, Swanson said. The incident is now one of 310 mass shootings in the US this year, according to the Gun Violence Archive.

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Persons: Eric Swanson, Joe Ostrander, Ostrander, Swanson Organizations: CNN, Tri -, Fire Protection, NBA Locations: DuPage County, Willowbrook, Chicago, Virginia, Colorado, California