A motorcycle parked outside the Stephanie Lynn Apartments on Mount Vernon accidentally caught fire, spreading to the apartment building Wednesday morning.

Quote from the article:

Eight of 16 units were left uninhabitable, according to a news release from the City of Springfield. The fire, which was ruled accidental, was caused because someone wanted to keep a motorcycle warm. That person parked the bike near the complex, covered it with a tarp and carpeting, and placed a heat lamp nearby. The heat lamp caught the bike on fire, and the fire spread to the complex. A police officer reported the fire at about 8:45 a.m. That meant alarming wake-up calls for some.

Source: Fire Bike, and Fire Apartment - Stupid Guy