Two male police officers are being treated in hospital after they were stabbed by a man with a knife near Leicester Square in central London.
The Metropolitan Police said a Taser was used during the incident at around 6am and a man was arrested on suspicion of grievous bodily harm and assaulting an emergency worker.
The condition of the two officers is not known.
Footage from the scene shows police officers guarding an area of Whitcomb Street which has been taped off.
The force added that inquiries into the “circumstances surrounding the incident are ongoing.”
London Mayor Sadiq Khan has condemned the attack and called for anyone with information about the incident to contact the police.
He described it as “utterly appalling”, adding that the officers “were doing their duty and assisting the public at this momentous time for our country”.
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“My thoughts and prayers are with them, their loved ones and police colleagues following this disgraceful attack.
“Attacks against the police will not be tolerated and any perpetrators will be caught and prosecuted,” he said.
The mayor added that he has spoken with the commissioner Sir Mark Rowley and remains in close contact.
