A group of climate change protesters have scaled the gates of Buckingham palace and chained themselves to the railings.
Four campaigners from a group called Climate Siren locked themselves to the gates just after 2 pm.
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The mayor said a post-Brexit visa system was needed to maintain the supply of skilled migrant workers for London's economy.
Peter Barnett made hundreds of trips from his home in Oxfordshire to Marylebone station without paying the full fare.
Police say he may have attacked more children and urged them to come forward.