TUTICORIN, July 22: A dry flower manufacturing unit in Tuticorin caught fire suddenly, destroying materials worth Rs 20,000. However, not one of the 300-odd workers in the factory, at the time of the fire, were injured. The cause of the fire is being investigated. The factory belongs to Ramesh Flowers, and about 100 workers from here were affected earlier by a gas leak allegedly from the nearby Sterlite copper smelter plant.