Provisional post mortem results on two bodies found in a swimming pool at an Essex hotel show that they drowned.
The man in his 30s and the woman in her 20s were pulled from the water at the Down Hall Country House Hotel at Hatfield Heath near Harlow.
They haven't yet been named.
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The employee was sorting through rubbish at waste company Amey's Waterbeach facility.
Ice is expected to form on some surfaces from late Tuesday afternoon and last overnight into Wednesday morning.