Then on June 3, eight people were killed and 48 were injured when three men drove a van into pedestrians on London Bridge before leaping out and launching a stabbing spree in nearby bars and restaurants.
Osborne's neighbor, 52-year-old Dave Ashford, told the Guardian he was shocked to discover that Osborne was suspected of being behind the attack.
"I tried to stop him (the suspect), some people were hitting him but I said stop him and keep him until the police came".
"I hit him on his stomach. and then me and the other guys. we held him to the ground until he couldn't move".
He has been arrested on suspicion of attempted murder, according to police.
Theresa May has also released a statement following the attack, describing it as a "terrible incident", adding: "All my thoughts are with those who have been injured, their loved ones and the emergency services on the scene".
The attacker has been named locally as father-of-four Darren Osborne, from Weston-Super-Mare in Somerset, according to The Telegraph.
At least one person has been killed and 10 injured in a suspected terror attack after a man driving a van allegedly shouting "I'm going to kill all Muslims" mowed down worshippers outside a mosque in North London.
- Mohammed Kozbar, trustee and mosque general secretary, said that the attack was aimed at "killing Muslims returning home after Ramadan prayers".
Finsbury Park attack: Man dies as van hits worshipers
Police confirmed one person has been arrested, with United Kingdom media reporting he was the driver of the van. The van reportedly came down the street, mounted the curb and drove into the crowd, according to the BBC .
"This was an attack on Muslims near their place of worship", she said in a televised address.
A police officer detains a man near the scene of the attack.
"These were the kinds of comments people were yelling out", she said.
London's mayor, Sadiq Khan, called the act "deliberate" and urged Londoners to "remain calm and vigilant". "We stopped him until the police came".
He added: "Given the methodology and given what was occurring, what's happened, the tragic incidents across the country, this had all the hallmarks of a terrorist incident".
They had been helping a man who had collapsed. Nine people were taken to hospital and two were treated at the scene.
The alleged attacker is now in custody, and a residence in Cardiff, Wales, is being inspected by the police as possibly associated with the incident.
There has been a reported surge in hate crime against Muslims in Britain following the London attacks carried out by Islamist extremists and a suicide bombing at an Ariana Grande concert at Manchester Arena on May 22 that killed 22 people, nearly half of whom were aged under 20.
It comes after two attacks in London in which pedestrians were struck by vehicles.