Two fires that burned Thursday night and early Friday morning in Colorado Springs were accidental, firefighters said.

Improper storage of flammable liquids caused a blaze at a vacant commercial building at 7625 N. Union Blvd. just north of Briargate Boulevard around 8 p.m. Thursday, Colorado Springs firefighters said. More than 30 firefighters responded and quickly extinguished the fire. No one was injured, firefighters said.

In the second fire early Friday morning in southeast Colorado Springs, five people were treated for smoke inhalation and taken to a hospital after a space heater sparked a fire in their mobile home. When firefighters arrived around 4 a.m., they found heavy smoke billowing from the home at the Meadows Mobile Home Park, 4825 Astrozon Blvd.