McKEES ROCKS, Pa. — (WPXI) – Sources say a dispute broke out between two firefighters during a response to an incident in McKees Rocks. WPXI believes the incident occurred while crews were battling a large structure fire on Olivia Street. The Stowe Township fire chief and a Preston firefighter became involved in a physical altercation, sources say. Channel 11 reached out to the Stowe Township fire chief who acknowledged there was a disagreement but would not comment any further. McKees Rocks police have said there was an altercation and are currently investigating.