Eleven people thought to have been involved in a shooting Sept. 7 at Fichtner-Mainwaring Park in Medford have been located by police.

Four people were struck by gunfire during the incident.

Jackson County Sheriff’s deputies arrested Lynch Castro, 18, of the 17200 block of Antioch Road, White City, Tuesday on suspicion of unlawful use of a weapon and riot.

The other alleged shooter, Bradley Allen Swift, 19, indicted for unlawful use of a weapon and riot, was still hospitalized as of mid-week, according to Medford police.

Iyannah Agustina Perezchica, 18, of the 3800 block Heritage Way, White City, was arrested by Medford police Wednesday for riot.

Marcus Darryl Houston, 19, of the 1500 block of Bryant Street, Medford, was arrested by Jackson County Sheriff’s deputies Tuesday for riot.

Moses Emanuel Lamas, 18, of the 1800 block of Crater Lake Avenue, Medford, was arrested by Jackson County Sheriff’s deputies Tuesday for riot.

Christian Warren Wagner, 20, of Aztec Circle, Medford, was arrested by Jackson County Sheriff’s deputies Tuesday for riot.

All of those involved were either released on their own recognizance or able to post bail.

Suspects either turned themselves in or were apprehended by law enforcement after a Jackson County Grand Jury decided to indict the 11 people last week.

Others charged with riot are Marlon Vaughn Dixon, 21; Austin Wesley Cady, 21; Sahara Jade Clemons, 18; Jose Maria Lapisco, 19; and Unique Shy Love Pasment, 19.

The charges are Class C felonies.

The term “riot” is used in Oregon Revised Statutes —ORS 166.015 — when offenses involve at least five people engaging in “tumultuous and violent conduct and thereby intentionally or recklessly creates a grave risk of causing public alarm.”

Police said there wasn’t enough evidence to bring additional, more serious charges. This was attributed to the victims’ “reluctance to cooperate with investigators,” said Medford police Lt. Mike Budreau.

Investigators found evidence of four firearms having been used, and 20 rounds were fired during the incident. Police described the shooting as an ongoing dispute between rival groups, “part of which is gang-related,” Budreau added.