A group of goats may have started a fire that destroyed a home in central Iowa, firefighters said.

The fire broke out early Tuesday near Norwalk. Three people in the house escaped unharmed.

John Hadley said his cat woke up him up, and he saw smoke coming from a ceiling. Hadley then woke up his ailing mother and her companion and got them out of the house.

The fire may have been started by some goats kept in a shed attached to the rear of the house, Assistant Northern Warren County Fire Chief Kevin Dingman said.

He said a space heater was kept in the shed to keep the goats warm, and the goats may have knocked it over, starting the fire.

The goats and a family dog were rescued, but a cat was missing.