The van's driver, a 48 year old man, was restrained at the scene of the attack, and the mosque's imam kept him from being attacked.
"At this early stage of investigation, no other suspects at the scene have been identified or reported to police, however the investigation continues", said Basu, London's senior counter-terrorism coordinator.
The police searched Osborne's home close to the Cardiff golf club in the northeast of the city suburbs.
A 47-year-old man has been arrested after a crowd ploughed into a crowd of pedestrians in north London.
Imam Mohammed Mahmoud, of the Muslim Welfare House, told the media: "We stopped all forms of attack and abuse towards him that were coming from every angle and, by coincidence, while the people who were tending to the injured were calling the emergency services, a police van drove past".
He said the attack was one of terror and that it was "similar" to those which have recently happened in Manchester, Westminster and London Bridge.
Condemning the incident, Prime Minister Theresa May said: "This is a bad incident", adding, "All my thoughts are with those who have been injured, their loved ones, and the emergency services on the scene".
However, Rowling reiterated her question concerning how exactly Osborne came to target Muslims, pointing out potentially inflammatory statements by right-wing columnist Katie Hopkins and British politician Nigel Farage.
Prime Minister Theresa May, who was heavily criticized for failing to meet survivors of a devastating fire in a London tower block last week, visited Finsbury Park Mosque where she met local faith leaders.More news: Most Americans think Trump tried to interfere with Russian Federation investigation
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Osborne was reportedly born in Singapore and is believed to have moved to Wales from Weston-Super-Mare in west England.
Video posted on social media shows the suspect waving and blowing kisses as he is packed into a police van.
The man was arrested on suspicion of attempted murder and police said they believed he had acted alone.
The attack outside the Muslim Welfare House comes on the heels of two recent attacks in London in which vehicles have also been used as weapons, both on bridges over the Thames River.
"Over the past weeks and months, Muslims have endured many incidents of Islamophobia and this is the most violent manifestation to date", said Harun Khan, head of the Muslim Council of Britain.
"While this appears to be an attack on a particular community, like the awful attacks in Manchester, Westminster and London Bridge, it is also an assault on all our shared values of tolerance, freedom and respect".
Mohammed Kozbar, chairman of the Finsbury Park Mosque, described the attack as "cowardly".
The pedestrians had been helping a man who had collapsed.
He then urged the crowd to remain calm until authorities arrived. That man later died but it is not yet clear if that was due to the terror attack. "He chose exactly the time that people pray, and the mosque is too small and full, so some pray outside".