SUNBURY, NORTHUMBERLAND COUNTY (WBRE/WYOU) — The Red Cross has been called to help four families who lost their homes in a Saturday afternoon fire.

According to Northumberland County Communication Center, crews were dispatched to a working second-alarm fire with minor explosions on State Street in Sunbury around 3:20 p.m.

A firefighter told 28/22 News they got to the scene to see the back of a duplex completely engulfed in flames. According to officials, propane tanks on the back porch of this duplex were exploding.

As crews battled the blaze, first responders said the intense heat melted live wires which made the firefight much more difficult.

Firefighters say the fire spread from one duplex to another causing heavy damage to the secondary duplex.

The second duplex hasn’t been considered a total loss; however, the original duplex was.

There were no injuries according to officials but the Red Cross was called to assist the four families whose homes were affected by the fire.

Investigators have not determined the cause of the fire at this time. A Pennsylvania State Police Fire Marshal has been scheduled to arrive on the scene Monday morning.