The 48-year-old man has been arrested on suspicion of attempted murder.
The BBC understands Mr Osborne grew up in Weston-super-Mare, Somerset, and has four children.
Earlier this month, a van veered into pedestrians on London Bridge, setting off vehicle and knife attacks that killed eight people and wounded many others on the bridge and in the nearby Borough Market area.
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.
One man died and 10 people were injured in the assault, the latest in a series of terror attacks to hit the United Kingdom this year.
"We stopped all forms of attack and abuse towards him that were coming every angle, and by coincidence while the people who were tending to the injured were calling emergency services, a police van drove past so we flagged them down". Regardless, it is more important than ever to support the Muslim community and to pay attention to how this pans out.
Cosby judge could revisit issue of revealing names of jurors
The mistrial isn't as conclusive a failure as the most widely feared outcome, a not-guilty verdict. The prosecution began with the 79-year-old entertainer's arrest on December 30, 2015.
One person was killed and 10 others injured on Monday when a van collided with pedestrians near a North London mosque in an incident which is being investigated by counter terrorism officers, police said.
Hussain Ali, 28, told the Press Association, a British news agency, that the leader of the mosque told the crowd "do not touch him" as they waited for the police to arrive.
London Mayor Sadiq Khan said extra police are being deployed to reassure communities, especially those observing Ramadan.
The van slammed into worshipers leaving the mosque after midnight Ramadan prayers, injuring nine people.
Ms Osborne said her son had never shown extremist views or behaviour.
Mohammed Kozbar, chairman of the Finsbury Park mosque, described it as a "cowardly attack which is no different from the attacks in Manchester or London", referring to the suicide bombing in Manchester in northwest England on May 22, which left 22 people dead.