A mother and her six young children have died after a powerful explosion in central Pennsylvania left their home engulfed in flames before rescue workers could reach it.Emergency crews were called to a home in Lamar Township in Clinton County near Mill Hall Sunday morning after reports of an explosion and fire. When firefighters arrived, they found the property completely ablaze and confirmed that seven people were trapped inside.According to the Pennsylvania State Police, the intensity of the fire made it impossible for crews to enter the building in time. All seven people died on the spot.Police later identified the victims as 34-year-old Sarah Stoltzfus and her six children, four sons, ages 11, 10, 5, and 3, and two daughters, ages 8 and 6.Investigators are still working to determine the exact cause of the explosion, but early indications suggest a propane leak inside the home may have caused the explosion. Officials said the propane tank located outside the home did not explode and that there was no known cause.Christina Duck, a neighbor, spoke to WNEP-TV describing the moment the explosion occurred.Duck said, “And I heard a bang and I could feel it and I got up and looked out the window and I saw flames coming out of the windows and I ran outside and within a minute the whole house was completely engulfed by it.”She said the family had moved into the house only a few months ago and she would often see the children playing outside.