Efforts to flush out Baltimore City’s storm drain system after an oil spill Wednesday leaked 5,000 gallons of diesel fuel into the Baltimore Harbor have been effective, says the U.S. Coast Guard.

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.

Many of the large pools of diesel fuel, noticeable by its distinct red color from dye, have been removed from Baltimore's harbor two days after a 2,000-gallon spill.