A senior Metropolitan Police officer has said the force will use "every power, tactic and tool" available to prevent further riots by far-right groups.
Violent disorder has been taking place across the country following the fatal stabbing of three young girls in Southport on July 29.
Violence flared after false reports were spread on social media suggesting the perpetrator was an Islamic asylum seeker, but continued after the lies were debunked.
Police have been injured, shop windows smashed and hotels housing asylum seekers targeted in cities including Nottingham, Hull, Hartlepool, Merseyside and Middlesbrough.
The Met arrested 100 people following riots in Whitehall last week.
Deputy Assistant Commissioner Andy Valentine, who is in charge of the capital's policing operation, said the Met "will not hesitate" to arrest more.
In the last two days the Labour Group in Harrow and the Finchley & Golders Green MP Sarah Sackman have said riots are planned locally.
DAC Valentine said: “This country is faced with one of the worst spates of violent disorder in the last decade. This is a national critical incident and we will do everything in our power to protect London and its communities.
“We know about the events planned by hateful and divisive groups across the capital tomorrow night. They’ve made their intention to cause disruption and division very clear.
“The scenes of racist, thuggish and criminal behaviour across the country have been deeply shocking. Members of the public and officers have been attacked, many have been injured."
He said none of this will be tolerated on London's streets.
“We will use every power, tactic and tool available to prevent further scenes of disorder," he added.
“Our message to anyone who plans to breed disorder is clear – you will face the full force of the law.
“Our officers put the safety of others above that of their own."
He said Londoners will see more officers in their areas and anyone who is concerned or needs help should speak to them.
“Our officers and our communities have truly pulled together in these difficult times," he added.
"We are proud to stand together against the vile and criminal behaviour we’ve seen in recent weeks.”
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