Reuben Page from the Environment Agency says that the oxygen levels in the canal are now back to normal.
The oxygen levels were affected by the recent warm weather, which the Environment Agency says usually only affects still water.
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Street artists from across the world have been working to transform more than 60 sites across Leicester with their art work.
Police are concerned for the welfare of 16-year-old Jamie Sidwell.
The store was evacuated and road closures were put in place following the incident.