Officers from Operation Yewtree have arrested an 80-year-old man on suspicion of sexual offences.
The man was arrested at an address in south London and has been taken into police custody.
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Police have charged a 29-year-old French man with the murder of a British backpacker in Australia.
Rescuers have worked through the night in an attempt to find survivors from Wednesday's devastating earthquake in central Italy.
Dozens are still feared trapped after a severe earthquake hit central Italy on Tuesday night.