At least 10 of the injured shooting victims have been hospitalized at the University Medical Center, local media reported.
Reporters working on the scene said the crowd of about 500 also included kids and teens.
Bunny Friend Park is named in honor of Joseph E. Friend and Ida Weis Friend's son, Bunny, who died at age 18.
Ida donated $4,000 to a fund to create a playground in memory of her son, and the fund grew into more than $10,000. She also donated a block of land to the city between Gallier and Desire streets. The playground established there was named Bunny Friend Park, and two of the the streets bordering the playground were later officially designated North Bunny Friend and South Bunny Friend.