The city's fire service said the fire broke out early in the morning in the six-story structure that dates back to World War II, news agency dpa reported. It wasn't immediately clear what caused the blaze in the building, where around 100 tons of essential oils were stored and a carpentry workshop also was located.
The fire brigade evacuated more than 60 people from nearby residential buildings after being alerted to the blaze shortly before 4.30 a.M. Later, an explosion occurred as firefighters tried to extinguish the blaze.
Later today, firefighters with breathing equipment were sent in to tackle the blaze.