Det Ch Insp Kevin Brown said: “We are in the very early stages of this investigation, but are treating this as a suspicious death.
“I want to reassure the community that this does not appear to be a random incident, we have a lot of officers conducting enquiries and at the scene and if anyone has any concerns, they can approach any of these officers.
“The scene watch on Belgrave Road is likely to stay in place for a number of hours. I apologise for the inconvenience to local residents but this has to remain in place whilst our investigation continues. I thank them for their patience."
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Tuesday's weather for the west of the region
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Causes are thought to be climate change, fisheries, disease, and pollution.