A senate official has said that a laboratory test confirmed a letter to the Senator contained poisonous ricin, according to the Associated Press. More tests are expected, the official added.
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Butterflies and nerves of steel were behind the images shared and seen by millions across the globe.
The Duke and Duchess of Sussex thanked everyone who took part in the celebrations on Saturday, Kensington Palace said.
Established in 1913, the flower show has become one of the world’s biggest showcases for horticultural excellence.