Lord Hermer, Labour's Attorney General, is being urged to 'enforce the law' following the arrest of more than 500 people at a Palestine Action rally.
The Metropolitan Police confirmed that 522 people were detained for displaying placards in support of the banned terror group in central London on Saturday.
The force said officers from its Counter Terrorism Command will work over the coming days to put together the case files needed to secure charges.
Scotland Yard also pointed to how, in some instances, securing a charge for an offence under the Terrorism Act can require the approval of the Attorney General.
The Tories have now piled pressure on Lord Hermer, who has faced intense scrutiny over his past client list while a human rights lawyer, not to block further action.
