The Metropolitan police more than doubled their spending on policing the protests against the DSEI arms fair in East London, a Freedom of Information request has revealed.
The cost this September was £2.4m, whereas it was only £978,000 the last time in 2017.
The Met spent £21m dealing with XR in October, much more than the £16m it spent in April.
By 10 October, XR itself had raised just over £2.5m in 12 months, according to the Financial Times.
Earlier, XR budgeted £1m for their own spending on the October rebellion.