People have been advised to avoid the beach at Half Moon Bay at Heysham after an apparent oil spill.
Lancaster City Council said there has been "a pollution incident" affecting beaches and water in the area.
They have asked people to stay away from the area until further notice while a clean up takes place.
The council said that responsible authorities were aware and are investigating.
"Our advice is to avoid the beach until further notice as residual contamination may still be present," said a Lancaster City Council public notice.
"Please avoid all contact with visible tar/oil on the beach and in the water.
"Please report any new contamination to Lancaster City Council on 01524 582000."
The photos below are from Half Moon Bay beach on Friday.


A Lancaster Police spokesperson said on Saturday: "Please be aware that Lancaster City Council along with other agencies are currently dealing with what looks like an oil spill on the beach at Half Moon Bay in Heysham.
"Please avoid the area where possible."


New four-day Lancaster Fringe Festival announced
Former Lancaster antiques centre revamp gets go-ahead
Controversial new housing plans near Lancaster given thumbs up
LISTEN: Plans revealed for 'permanent seasonal' Lancaster On Ice
Morecambe woman charged with murder following death of eight-week-old baby
Rescue after person stuck in mud in Lancaster
Hundreds expected at Eden Project Morecambe 'breaking ground ceremony'
Morecambe children's nursery announces plans to close during extreme heat
Lancaster MP responds to Sir Keir Starmer's resignation as Prime Minister
Carnforth High School praised as a "caring community" in Ofsted report
Body of man found in Lancaster park
LISTEN and PHOTOS: Armed Forces weekend will return after massive crowds enjoy biggest ever event
Morecambe MP says Sir Keir Starmer "has made right decision" as Prime Minister resigns
Limited edition artwork will raise vital funds for Lancaster community group
Green Heritage Plaque marks first home of Lancaster University
New home revealed for £20m Morecambe West End regeneration scheme
Wooden nests take flight in Lancaster and Morecambe to stop decline of endangered birds
Veterans salute as Armed Forces Day flag raised at start of celebration weekend in Morecambe
Vandals cause delays to aqueduct sinkhole repairs in Lancaster
Extra Care scheme to open in Lancaster

