LEADVILLE, Colo. -

Authorities are investigating a hash oil explosion at a home in Leadville.

The Lake County Office of Emergency Management says butane being used to make hash oil caused an explosion on Monday which shattered windows in the home in the historic mining town.
    
Photos posted on the office's Facebook page show the home's kitchen in disarray, with a counter tilted away from the wall. Emergency management spokeswoman Betty Benson says the explosion blew the door off the refrigerator.
    
It's at least the fourth suspected hash oil explosion in Colorado in the last week.
    
Hash oil is a high potency extract of marijuana. Authorities say the butane can easily find an ignition source and cause an explosion.