Firefighters are still working to fully extinguish a warehouse fire in Baltimore that rose to seven alarms overnight and has disrupted train service along the busy corridor between New York and Washington,

Amtrak service was temporarily disrupted overnight as crews battled a fire at an empty mattress warehouse in West Baltimore.

Subsurface levels were stacked with mattresses, the city's fire chief said, and the blaze had grown to seven alarms by early Tuesday.