Emergency personnel are at the scene of a mass shooting in the US state of Baltimore.

The Baltimore Police Department confirmed there has been a mass shooting early on Sunday morning. 

The number of victims was not immediately provided.

Acting Commissioner Richard Worley was at the scene of the shooting, police said.

There were multiple fatalities and dozens of people injured in the Brooklyn Homes area of South Baltimore and a large police and emergency medical response in the area, WBFF-TV reported.

Witnesses told the station that hundreds of people were gathered for an event called Brooklyn Day.

A press conference with additional details was planned for later in the morning.