Fire officials are still trying to figure out what caused the basement of a north Nampa home to catch fire Monday morning.

Crews sent to the home at 10 North State Street just after 4:30 a.m. found an active fire in the basement area and called for second alarm. The fire was moving to the ground floor but crews were able to knock down the flames quickly, officials said.

A man who lived at the home was outside when fire crews arrived. He was taken to a local hospital, where he was treated for smoke inhalation and released, according to reports.

Fire officials say the home was badly damaged by the fire and is currently not safe to live in. The estimated cost of damage was in excess of $30,000.

Investigators were still at the house Monday afternoon but had not yet been able to identify a cause as of 2 p.m.