One person was injured in a mobile home fire in Cape Girardeau on Saturday night. Cape Girardeau firemen were dispatched to a residence at 555 N. Spring Avenue at 8:30.a.m. When they arrived one third of the structure was on fire. Firefighters from both Jackson and Scott City helped put out the flames. Firefighters were able to extinguish the flames within 15 minutes. The trailer was vacant when the fire began, but one person sustained an undisclosed injury. The cause of the fire is still under investigation.