By Dana Griffin
Part of the burned out triple-decker in Pawtucket has already come down.
Investigators just wrapped up their investigation. the rest of the building will be demolished Wednesday night.
The Public Utilities Commission said the outside gas pipes are in working order and there are no gas leaks.
National Grid has been cleared of any malfunction on its end.
Investigators say whatever caused the explosion came form inside the building.
An exact cause has not been determined.
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