OKLAHOMA CITY - The Oklahoma City Fire Department responded to a reported chlorine leak at a water treatment facility in NW OKC Monday.

Crews were called out just before 9 p.m. to check on a chlorine leak at the Hefner Water Treatment Plant located in the 3800 block of W. Hefner Rd.

Nearly 50 firefighters arrived on scene to assist with locating the leak. 

Officials say the Hazardous Materials Task Force performed an investigation and believe that they have stopped the leak.

Residents in the area who smell chlorine have been asked to call 911. 

Firefighters are continuing the investigation to see if the leak has spread to manholes, but say there is no immediate hazard. 

No evacuations have occurred.  

This a developing story. Stay with News 9 and News9.com for updates as information becomes available.