Phoenix and Scottsdale companies were alerted to a house fire with possible people trapped. Engine 49 went straight into the scene and reported heavy smoke from the roof of the house and evacuation was completed. Engine 929 brought up a supply line to feed Engine 49. Ladder 615 arrived to set up defensively on the East side of the house. Interior crews of Engine 49 and Engine 929 reported a collapse and went defensive. Battalion 602 assumed Command and requested a 1st alarm. Engine 45 arrived a pumped Engine 929's plug down the block. Ladder 615 went to work with the aerial to knock down the bulk of the fire before companies went back interior to mop up.