Small, specially placed explosives were used to drain the last of the residue inside one of 14 propane tankers that derailed earlier this month. The National Guard had called in an expert to vent the last of the fuel after pressure began to build in one tanker. As a result, officials suspended the return of evacuated residents to their homes. Thirty-six residents who made it home were allowed to stay. There was no word on when the remaining residents would return. All 1,700 residents were evacuated March 4 after 35 freight tankers derailed.