Describing the events of Saturday morning, the Ukrainian embassy said that after seeing the ambassador's auto being targeted, police "blocked up" the other vehicle.
Armed Police opened fire on auto speeding towards the Ukrainian ambassador's vehicle.
London's Metropolitan Police said firearms and stun guns were used to stop and detain a suspect who drove a vehicle at the police auto when police arrived on the scene. As the spokesman explained, a person inside the auto that rammed into the diplomat's vehicle posed a threat and thus police had to open fire.
"In response, the police were forced to open fire on the perpetrator's vehicle". As police officers arrived at the scene, the vehicle then drove towards them, prompting them to open fire, shooting at the driver through the auto window.
"A man, aged in his 40s, was arrested on suspicion of the attempted murder of police officers and criminal damage", the report said.
The man, who was not injured, has been taken to a central London hospital as a precaution. However, law enforcement stressed that they were not treating the incident as terrorist-related.
"No one of the embassy staff were injured", the embassy said.
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Commenting on the incident, the Metropolitan police stated that they have opened an investigation into the attack.
The drama, in Holland Park's "Millionaire's Row", began after a man in a silver Mercedes drove into the official vehicle used by Natalia Galibarenko, who has represented Kiev in the United Kingdom since 2015. Witnesses heard at least 10 gunshots fired.
The woman, who did not wish to be named, said officers arrived "very quick", adding: "I saw many police cars coming".
The vehicle, which a police source said was a Mercedes, appeared to have been backed into the black auto.
Ch Supt Andy Walker said the firing of a police firearm would be investigated.
TV footage later showed a silver auto slewed across the cordoned-off road with its driver's door open and window shattered.