Sydney Opera House in special blue lighting
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Landmarks lit up in blue for World Autism Day

3 April 2013 Last updated at 13:56 BST

Landmarks have been lit up in blue in dozens of cities around the globe to mark World Autism Day‚Äč on April 2nd.

The UN has been marking the day since 2007 to raise awareness of the condition which affects millions.

Roopa Suchak reports.