Organisers say 7,000 officers and staff will be on site today and tomorrow with live facial recognition cameras and screening arches to detect weapons at the busiest entry points.

Some 7,000 Metropolitan Police officers and staff will be trying to keep up to two million revellers safe as they descend on the packed streets of West London this weekend.

Met Police carried out ‘intelligence-led interventions’ which saw 21 people recalled to prison and 266 people barred from the event

The Met said 21 people were recalled to prison, and 11 firearms and more than 40 knives seized in a bid to target those who 'pose the greatest risk' of causing trouble.

Met commanders warn ‘not all risks will have been mitigated’ despite organisers’ insistence that new safety measures are in place

Organisers say 7,000 officers and staff will be on site today and tomorrow with live facial recognition cameras and screening arches to detect weapons at the busiest entry points.

In an update at 8pm on Sunday, the force said dozens of arrests were made on the opening day, including 15 for assaults on police.

Even the harshest critics of the Metropolitan Police admit the force has its work cut out with the Notting Hill Carnival.