One missing after Sydney fire A PERSON is missing with a house engulfed in fire in Sydney's north. Six crews are at the scene trying to put out the Mount Colah blaze, a Fire and Rescue spokeswoman said on Wednesday afternoon. Two people have been accounted for while one person, reportedly a disabled child, is unaccounted for. One level of the split level home is fully engulfed in flames and more crews are on the way, the spokeswoman said. Police say a mother and son have been taken to Hornsby Hospital suffering from smoke inhalation but one person remains missing and a search of the house is underway. Firefighters have been working to extinguish the blaze. Homes in neighbouring Excelsior Road have been evacuated as a precaution.