A 3-alarm house fire on Kimlo Road in Wellesley had police and firefighters scrambling this morning. All those livng in the house escaped unharmed. The fire was brought under control, though Rte. 9 east and other area roads were hit with traffic delays. The cause of the fire is under investigation according to WHDH-TV, which has video coverage. WBZ-TV reported that two firefighters were being treated for heat exhaustion.