Fire investigators believe a natural gas line or propane tanks caused a home to explode in a Sultan neighborhood early Thursday morning. The explosion along Kessler Drive was felt all over the city. "The header that used to hold the garage door in place is now laying about 20 feet from the front of the building out here against the back of those cars," said neighbor Brent Nault whose home caught on fire from the explosion next door. The house next door to Nault's exploded into a fireball with no warning. The flames then spread to his own home.