The operation began after 10:30 p.m. Earlier, someone had been spotted on the viaduct.
An emergency medical team and two Fire Service units are on site. Firefighters are checking the entire viaduct.
Trains are running, but passing through slowly.
Update: 10:55 p.m.
The operation lasted about 15 minutes. The firefighters did not find anyone on the viaduct. This time, tragedy was avoided.
The entire operation could be watched live on our Facebook page.