UPDATE: 2:10 P.M.
The City of Marion says around 7 a.m. a city employee went missing at the Wastewater Treatment facility.
Emergency crews were dispatched and around 10 a.m. crews located a body in one of the treated water ponds and recovered the remains of the suspected missing employee.
An investigation is ongoing and more information will be released as it becomes available.
The employee's name is being withheld, pending notifying the family.
MARION (WSIL) -- First responders from several communities gathered inside the Marion Wastewater Treatment Plant.
News 3 arrived just after 9:30 a.m. Sunday at the intersection of Van Buren and Boyton Streets at the plant's entrance.
Just before 8:30 a.m., the Southern Illinois Fire Incidents Facebook page posted about a possible drowning that required mutual aid. A News 3 WSIL reporter saw a mutual aid truck leaving the treatment plant.
Police on scene didn't say why multiple units converged there. The reporter witnessed a United Medical Response ambulance leave the scene. Three fire trucks and multiple police and emergency units also left before 11 a.m.
News 3 asked Marion city manager Cody Moake if he was aware of a search happening at the plant. He texted, 'Yes, we have no comment at this time.'
Mayor Mike Absher says more details will be released later in the day. Stick with News 3 WSIL for more developments on this story.