Authorities have concluded their investigation into last week's warehouse fire on Grand Forks' north end, but the cause remains unclear.

Tuesday, the Grand Forks Fire Department announced its fire marshal's office had concluded its investigation into the fire at 1720 Mill Road. The cause of the fire, which occurred on April 16, "will be classified as undetermined," according to a press release from the department.

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"Based on information obtained through interviews, as well as the type of equipment within the area of fire origin, one possible cause of the fire was the failure of electrical equipment being used in the building," the release stated.

The building, owned by 3G Ventures, housed several servers presumably related to internet data. Battalion Chief Bruce Weymier last week told the Herald that the warehouse was a total loss.

The fire department on Tuesday said its investigation had been "hindered due to the structural condition of the building and the excessive amount of damage to the building and the contents."