"Don't jump in the Jubilee River" - that's the warning from Berkshire fire and rescue safter finding dangerous scrap metal in the waters.
It comes after firefighters released a warning over swimming in the River Thames after a body of a teenage boy was recovered in Bourne End by drivers over the Bank Holiday weekend.
Emergency services, search teams and divers descended on the river but tragically the boy's body was found.
It happened the same day that a woman's body was pulled from the Thames further down at Boulters Lock in Maidenhead.
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Royal Berkshire Fire and Rescue Service- who attended with crews from Beaconsfield, High Wycombe, Maidenhead, Slough and Reading as well as four officers and water rescue boats - have now issued an urgent warning not to swim in rivers, lakes or canals - whatever the weather.
Many people have been taking advantage of the hot weather recently by cooling off in the Thames - but there are hidden dangers underneath the calm looking surface.
Berkshire fire and rescue said: "Thinking of jumping in the Jubilee River to cool down as the temperature rises? Sure you know what is under the water?
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"This is the rusty, mangled mess pulled from just some of the waterways in the county. Not only can people drown from the impact of just jumping into the water from cold water shock - but could be landing on the metal spikes of old bikes, trolleys and old signs.
"Don't jump in the Jubilee River."
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