UPDATE: All workers safe after furnace explosion

UPDATE AT 6:25 P.M. (WZZM) -- Emergency crews say everyone is accounted for following an explosion at a Norton Shores foundry.

It happened around 5 p.m. Monday at the Cannon Muskegon Group, a facility that makes metal alloys for the aerospace industry and other customers.

Firefighters say there was an explosion in a furnace fed by a natural gas line.  Ten workers were around the furnace when it exploded, but no one was injured and all of them made it out of the building safely.  Twenty-five other people in other parts of the building were also evacuated from the plant.

Crews say the fire spread to the natural gas line feeding the furnace, but firefighters were able to shut off the line.

Workers say some molten metal spilled from the furnace.  Firefighters are being careful not to spray the metal with water, as they say that could re-ignite a fire.

NORTON SHORES, Mich. (WZZM) -- Emergency crews are on the scene of a boiler explosion at Cannon Muskegon Corporation in Norton Shores. The facility is located in the 2800 block of Lincoln Street near Norman. 

Investigators says residents in the area report three large explosions and say they one could be felt from inside their homes.  

We are told there were employees inside the building when the explosion happened but it's not known if anyone is hurt.

We will continue to follow the story and bring you updates as they become available.