An Amish mother and her six children were killed in a fast-moving house fire following an explosion in Lamar Township, Pennsylvania.

Authorities said all seven victims were trapped inside the home and died before firefighters could rescue them.

Investigators believe a possible propane leak may have triggered the blast, though external tanks were not involved.

Neighbors reported hearing a loud explosion before the house was quickly engulfed in flames, ABC News has reported.

The victims, identified as Sarah Stoltzfus and her children, were members of the Old Order Amish community.