This map shows the locations across the South East where suspect packages have been found in the last three days.
The blue markers designate packages that were found on Tuesday, green is for yesterday and the red markers are for today.
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Penny Mordaunt called it an “historic and great” day for Ireland.
A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
Counting will begin on Saturday morning, with the result expected later in the day.