Fire investigators say the cause of a fire that ripped through two houses in Saskatoon’s Lakeridge neighbourhood early Thursday remains undetermined.

The blaze, which started at a home a 706 block of Brightsand Crescent and spread to a neighbouring home, caused an estimated$1 million in damage.

The house where the fire originated was so badly damaged that investigators were unable to access the interior safely, according to Saskatoon Fire and Protective Services.

A back hoe was used to remove some of the debris from the house, but investigators not able to determine cause and the remaining structure was demolished due to safety concerns.

Fire crews from three stations were greeted by flames reaching as high as 30 feet in the air when they arrived on scene at 2:30 a.m. Thursday. That led to fire officials issuing a second alarm that saw crews from two more stations join the effort. At its peak, eight pieces of apparatus and 32 firefighters were on scene.