Thousands of people across the UK are being contacted after a healthcare worker infected two patients with the hepatitis C virus.
A major alert is under way after it was discovered that a retired obstetrics and gynaecology worker unknowingly had the virus while employed by the NHS for decades.
It is known the healthcare worker infected two patients with the virus while working at a hospital in Wales, Public Health England said.
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Five people were killed and dozens more were injured after a car and knife attack in the capital on Wednesday afternoon.
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.