The First Great Western train service is suspended between Liskeard and Looe because of a problem with line-side equipment.
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The man and woman in their 20s, fell ill after mixing two domestic cleaning products in a bathroom, creating dangerous chlorine gas.
It will be a dry start to the day with sunny spells. However, thicker cloud and rain will arrive from the west during the afternoon.
Most areas will have a dry morning with some bright spells.