Video shows aftermath of the deadly Minnehaha Academy explosion

The explosion apparently happened when a gas meter was being moved.

Video posted to Twitter by the National Transportation Safety Board shows how much damage last week's natural gas explosion caused to the building. 

The NTSB said its early investigative findings show the explosion likely happened while a gas meter was being moved by a father-and-son team from Master Mechanical, the Star Tribune reported

CenterPoint Energy hired the company to move the gas meter from inside the building to the outside to get easier access, KARE 11 said

NTSB Chairman Christopher Hart described moving the meter as a "very hazardous operation," the Star Tribune says, adding they're investigating what may have gone wrong or if the workers were tired or impaired prior to the explosion. 

The incident killed two longtime employees, 47-year-old Ruth Berg and 82-year-old John Carlson, who both died from "multiple blunt force injuries sustained in a building collapse." 

A memorial service for Carlson was held Sunday, KARE 11 says. A service for Berg has not yet been announced. 

Nine others were injured in the incident. And as of Thursday, all but two people had been released from the hospital. 

Funds set up for the school

The first day of school at Minnehaha Academy's Upper School, where the explosion happened, has been delayed by two weeks. Kids were supposed to start Aug. 23, but now they'll begin Sept. 5.

The school started a disaster relief fund to help rebuild the damaged area of the school, and support the victims. And an alum of the school created a GoFundMe to help pay for rebuild work as well.

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