Investigations are continuing into what may have caused an oil spill which led to around 150 swans having to be rescued from the River Thames between Windsor Bridge and Eton Bridge over the weekend.
The Environment Agency has said the mystery substance could have been caused by illegal flytipping, leakage from boats or tanks, or faulty drainage.
It is hoped that the birds, which are being cared for by charity Swan Lifeline, can be released on Tuesday.
More top news
Philippa has the weather update for the east
Philippa has the weather update for the west
69 year-old Peter Sutcliffe has been photographed in The Sun on Sunday on a visit to Frimley Park Hospital in Surrey.