ARLINGTON, Va. (WUSA9) -- The Coast Guard said Monday that fuel oil was discovered in Roaches Run Wildfowl Sanctuary and the Potomac River. Now they're trying to figure out where it came from.
Officials say that's challenging because the system that drains into the river dates back to the 1800s.
On Monday, the Coast Guard and other agencies popped manholes in Arlington trying to figure out how oil got into the Potomac River.
The systems drain into Roaches Run Wildfowl Sanctuary. That's where the oil first appeared about a week ago.
"It is always a huge disappointment when something like this happens," One park-goer said.
Especially since geese and other animals are supposed to be protected there.
On Friday, our cameras caught Canada geese covered in oil.