(Cedar Mill, OR) -- Two homes were damaged by fire Saturday night in Cedar Mill. When Tualatin Valley Fire & Rescue crews arrived, one home was fully involved and flames were spreading to a neighboring house. Firefighters searched the second home and no one was inside. A second alarm was called to get help fighting both fires. The stairs burned through in the first home, so firefighters had to use ladders and an aerial bucket to reach the second floor of the home. The fires were brought under control. One resident suffered a minor injury. The investigation into the cause of the fire is ongoing.