Colorado wildfire investigation could take days or weeks, says county sheriff

Investigators interview dozens of people as Joe Pelle says getting it right is more important than the urge for speed'

Federal and state investigators have interviewed dozens of people in their search for the cause of a destructive Colorado wildfire but the investigation could take days if not weeks, the Boulder county sheriff warned.

Declaring that the stakes are huge", Joe Pelle said he would not release details until he was ready to announce some progress - perhaps that may be a week, perhaps that may be a month".