A car mounted the pavement and ploughed into a crowd outside the museum in South Kensington around 2.21 p.m. BST on Oct. 7.
In an earlier statement, police said a man had been arrested. An image and footage of a man being restrained by four people emerged on twitter.
The man detained by officers is now in custody in a North London police station.
The nature of the crash—a vehicle ploughing into a crowd of people—had some speculating online, that it might have been a terror attack.
Some people expressed their concerns on social media. “Apparently some kind of terror panic in South Kensington (London) Nr museums with 100s of people fleeing down the street,” said one Twitter user.
The Metropolitan Police confirmed in a statement that the crash is being treated as “a road traffic investigation”.
The museum was evacuated and the area was cordoned off with police tape, while reports said there were helicopters above and emergency services at the scene.
In June, three ISIS terrorists drove a hired van into pedestrians on London Bridge before stabbing people in nearby Borough Market. The attack left eight people dead and injured 48. Later in June, a man mowed down worshippers in Finsbury Park mosque leaving one man dead.
Shortly after the crash, Prime Minister Theresa May tweeted: “My thanks to the first responders at this incident this afternoon and the actions of members of the public. My thoughts are with the injured”.
The London Ambulance Service said in a statement that 11 people were injured, with mostly leg and head injuries, and nine people were taken to hospital.