The driver had a license issued by Kyrgyzstan.
Eight people, two of them Mexican, have been injured after a taxi mounted the pavement close to Red Square in Moscow.
There is now no details on the condition of those who were injured. It then hit a traffic sign and bystanders tried to wrestle the driver out of the taxi, but he broke their grip and ran away; it was not clear how he was finally detained.
"He just does not get injuries, it's impossible to break him."". Preliminary information indicated the driver lost control of the vehicle.
Russia is now hosting the soccer tournament and Moscow is one of 11 Russian cities where World Cup games are being played.
Mexican nationals were among the injured, it said. He said several people were injured and received the necessary medical assistance. "He was shouting: "It wasn't me".More news: Central Colorado wildfire likely human-caused
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Asked if the driver appeared drunk, the witness said: "No, he wasn't drunk".
The Moscow traffic authority has said the taxi driver said he was not acting on goal.
Two ambulances quickly arrived at the scene and seven people were taken to hospital.
The accident took place on Ilinka Street, around 200 metres from Red Square and Moscow's famous GUM shopping centre.
Russian Federation hosts the 2018 FIFA World Cup from June 14 to July 15.