Showers have been banned and bottled drinking water provided on two wards at the Leicester General Hospital, after a potentially lethal bug was found in the water supply.
The hospital says that routine testing of the water supply has shown that higher than normal levels of Legionella bacteria were present on wards 28 and 29, triggering its safety plan.
The potentially lethal bug can cause a form of pneumonia called Legionnaires.
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Six addresses have been searched as part of police investigations so far and seven arrests have been made.
A large part of Hagley Road in the south west of the city was cordoned off and later reopened.