At 12:15 A.M. Monday morning City of Waco(TX) units responded to a reported house fire with 3 persons trapped inside. 2 minutes after dispatch Chief 3 & Engine 6 arrived to find heavy smoke coming from a single story residence. Quints 7 & 2, Engine 1, and Rescue 2 arrived and assisted. Engine 6's crew found 2 elderly woman in a back bedroom, and removed them from the residence. The 3rd reported trapped person was already outside. The stubborn fire which had extended into the attic was controlled within 30 minutes. Engines 4 & 9 latere arrived for manpower relief.(This was the 2nd house fire of the shift)