Detectives investigating the murder of 15-year-old Sofyen Belamouadden at one of London's busiest Underground stations have arrested a teenage girl.
Metropolitan Police investigators held the girl and three more teenage boys during a series of raids in south London.
The move brings the total number of people arrested over the attack at Victoria during last Thursday's rush-hour to 24.
Twelve teenagers have been charged with killing the aspiring footballer from Acton, west London.
The boys, all from south London, are due to appear at South London Youth Court.