Incident happened early Thursday morning
Police activity was spotted near the Allegheny County Sanitary Authority plant.
The police activity was near a cliff that a person might have fallen from and the person that fell was reportedly either on or near railroad tracks.
Oncoming train traffic was stopped for about an hour due to the police activity.
State police said any further details about the police activity will come in a news release at a later time.
Source: State police investigating after incident that left one person injured in Pittsburgh
