Officials said no one was injured in the blast Monday evening, which prompted a mayday call when it was reported near the site of last year's Francis Scott Key Bridge collapse.

The main channel used by cargo ships to enter and exit the Port of Baltimore was closed off Tuesday as the Coast Guard sought to probe the cause of a Monday evening explosion on board a coal

The blast happened near the site of last year's deadly Francis Scott Key Bridge collapse, the Coast Guard said, and the resulting fire was extinguished.