Edinburgh residents raised the alarm after spotting an 'oil slick' in the Water of Leith on Thursday, March 30.
Environmental experts have now launched an investigation after receiving a number of reports about a concerning oily appearance of the water.
The Scottish Environmental Protection Agency has confirmed that officers are investigating the 'oil spill' in Leith and are urging anyone with information that can help them to locate the source of the oil to get in touch.
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Hilary Thacker, Treasurer and Lead Researcher of Friends of the Waters of Leith Basin (FOWLB) also went down on Thursday to investigate.
Speaking to Edinburgh Live, the volunteer said: "We're looking into it and are hot on to the case. Various people have been ringing me around the shore and we have some very good ideas about what has been causing it, but it's slightly too early to say."
FOWLB is an organisation run by volunteers who are dedicated in preserving and enhancing the Leith Basins and regularly clean up the rivers to reduce the pollution.
A spokesperson for SEPA said: “SEPA has received a number of reports from members of the public concerned about an oily substance in the Water of Leith. A SEPA officer has attended and an investigation into the source has begun.
“If anyone has any information that may help us to locate the source of the oil, please contact SEPA through our pollution hotline - either online at sepa.org.uk/report or via telephone on 0800 80 70 60.”
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