The anti-capitalist Occupy movement says several of its supporters have chained themselves to the pulpit of St. Paul's Cathedral.
The action marks one year since the movement's protesters began their camp outside the cathedral.
The St Paul's camp was forcibly removed by authorities back in February this year.
City of London Police are at the cathedral but the women from the anti-corporate group are understood still to be inside.
More top news
Jeremy Renner has joked that director Joss Whedon's task on The Avengers film set is like "herding kittens".
Monster hunters can now explore Loch Ness on Google Maps - but will you be able to spot Nessie?
An elderly and vulnerable man is fighting for his life after being mugged while riding a mobility scooter.