At least 11 injured after explosion rips through Kentucky neighborhood

Multiple people are missing after a building collapsed amid an explosion in Louisville, Kentucky, leaving at least 11 people injured. 

CBS affiliate WLKY has shared dramatic drone footage showing a blackened husk of debris in the middle of a partially-destroyed multi-story building. 

Fire authorities said the blast happened on the 1900 block of Payne Street in the Clifton neighborhood of Louisville on Tuesday afternoon.   

Sources told WLKY that people are 'missing and trapped inside', while residents reported hearing a loud boom from miles away. 

However, Louisville Mayor Craig Greenberg later said everyone was accounted for and there had not been any fatalities despite the destruction.  

'The cause at this point of the explosion is unknown,' said Louisville Mayor Craig Greenberg. No one died in the explosion, he added. 

The structure appears to be a commercial building, hosting businesses including natural food coloring company DD Williamson, or Givaudan Sense Colour. 

It is not known at this time how many people were inside the building at the time of the blast. 

Officials said at least 11 people had been taken to local hospitals, all employees. 

Greenburg said officials spoke to workers inside the plant. 'They have initially conveyed that everything was normal activity when the explosion occurred,' he said. 

Louisville Fire Department described the blast as a 'large scale incident', while Louisville Metro Emergency Services urged people within a mile of the business to shelter in place. 

This is a breaking news story with updates to follow.