The Environment Agency said the low oxygen level in Pittville Lake could be algal bloom or sediment stirred up by rain, or both.
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Emergency services say they will working long into the night to deal with a fire that began in a music shop near the centre of Exeter.
Leon Dexter was set upon by the birds in Ilfracombe in the latest in a series of attacks by seagulls in our region.
Emergency services are tackling the fire on Sidwell Street near the centre of Exeter.