The Library of Birmingham has received 100,000 visitors since it opened last week.
The building, which cost £189 million to build, is the biggest library in Europe.
Bosses originally predicted that 10,000 people would visit each day.
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The woman was arrested after police found the body of an elderly woman on Sunday (22 October).
Cloudy with outbreaks of rain across the region this morning but will brighten up in the afternoon, leading to sunny spells.
A cloudy, damp and breezy start to the day but will slowly brighten up as the day goes on.