SPOKANE, Wash. -

A brush fire in North Spokane sent smoke into the sky that could be seen from the South Hill on Sunday. 

It sparked around noon near Ruby and Sharp. The flames were surrounded by Taco Time, a warehouse, and the Kennedy Apartments at Gonzaga.

Firefighters deemed it was too risky to try and fight the flames so they stood by the structures and kept a close eye on the flames.

"We allowed the fire to burn out to the streets or to the sidewalks and we protected the structures nearby," SFD Battalion Chief Steve Sabo said.

The cause is under investigation, but firefighters were told someone was working on some metal machinery in the field right before it sparked. Once the flames died down, firefighters ensured they wouldn't flare up.

"We went ahead and used our drip torches and just intentionally lit those areas understanding that there was no exposure risk and it would actually be more beneficial to everyone in the long run," Sabo said.

A half acre was burned.