A third person has died after tornadoes hit the US state of Illinois, authorities there told the Associated Press news agency.
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Scientists are research a blood test which can detect colon, lung, breast, stomach and endometrial cancer.
Transport bosses are said to be in "active discussions" with the company to encourage it to extend its pilot scheme to the UK's capital.
Reports suggest the 67-year-old is expected to be named as one of the hosts of the new series within days.