Paris (dpa) - In a bakery in the center of Paris it came in the morning to an explosion. That said a spokeswoman for the police. There is a fire, the explosion was strong. Whether people were injured was initially unclear. Also, how it came to the explosion, said the spokeswoman initially not. The authorities in Paris are on alert for announced demonstrations of the "yellow vests". Around 5,000 security forces are deployed in the capital to hedge the protests.