Some 2,000 gallons of diesel meant for backup generators spilled into the Patapsco River in Baltimore, Maryland, on Wednesday, upon overfilling the tanks. Officials are using oil absorbent materials and skimmers to rid the river of the diesel,

At least 2,000 gallons of oil have spilled into the Baltimore Harbor as cleanup efforts are currently underway, officials said.

Emergency crews from a host of government agencies were working through the night to clean up an estimated 2,000-gallon diesel spill in Baltimore’s Inner Harbor that started on Wednesday.