A&E services at County Hospital in Stafford have been suspended for under 18s because "senior clinicians have advised that the service is not currently clinically safe", University Hospitals of North Midlands NHS Trust has said.
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Police are appealing for witnesses after the incident at St Andrews Parish Church Cemetery on Pershore Road in Evesham.
The officer was involved in a crash with a car that was being pursued by his police colleagues after it failed to stop for them.
There is a huge demand by hospitals for the blood group RO, which is used to treat sickle cell anaemia.