"There has been an outpouring of sympathy for all the recent terror attacks but hardly a whisper on this attack", said 23-year-old Ali Habib, who described how the white van swerve into a crowd of worshippers gathered outside a mosque following evening prayers.
London Mayor Sadiq Khan, unlike London authorities, has referred to the incident as a "horrific terrorist attack".
The British Prime Minister was greeted with cries such as "have you got a faster taxi today?" and "how can you be so quick today?" from crowds outside Finsbury Park Mosque as she left to get into a auto back to Downing Street.
It also follows a suicide bombing at a pop concert in Manchester, northern England, in May which killed 22, while in March, a man drove a rented auto into pedestrians on Westminster Bridge in London and stabbed a policeman to death before being shot dead.
Residents of Finsbury Park said they were angry that the police seemed slow to call Monday's incident a "terror attack".
The constant specter of terrorism in London is something that Zara, 40, a Muslim and Finsbury Park local, has been struggling to grapple with.
The attack took place after worshipers had finished prayers during the holy month of Ramadan.
Britain's terror alert level is at "severe", meaning security officials believe an attack is highly likely.
May said her government would "stop at nothing" to defeat extremism.
Vehicle strikes several pedestrians on London road
Police have not named the man arrested, but the van bears the logo and phone number for Pontyclun Van Hire in south Wales. He was later criticized after he launched a Twitter attack on London Mayor Sadiq Khan in the wake of that attack.
One person died during the incident, which took place in the early hours of Monday, and eight more were seriously injured.
"Over the past weeks and months, Muslims have endured many incidents of Islamophobia, and this is the most violent manifestation to date".
Khan says all these incidents are attacks on the city's shared values.
He said there had been a spike in Islamophobic hate crimes since the London Bridge terrorist attack.
"People were shouting this is an act of terrorism, even though he's white", another witness, Hillary Briffa, said, referring to the man taken away be police.
The Leader of the Opposition praised the emergency services for their "very quick and very timely" response after the driver was arrested at the scene.
"Local worshippers apprehended the man in the van who mowed down the pedestrians".
Deputy Assistant Commissioner Neil Basu said the people at the scene "worked with officers to calmly and quickly get him into our custody". The attack killed five people.
He said: "During the night, ordinary British citizens were set upon while they were going about their lives, completing their night worship. My prayers are with the victims and their families", read the statement. In 2014, it became one of only three faith organizations - and the first Muslim group - to achieve the VISIBLE standard, which recognizes independent community organizations that deliver services for local people and build partnerships with other groups. "We saw that clearly after London Bridge", he said.