His relatives say they are "massively shocked" and "their hearts go out to the injured".
"I hit him on his stomach. and then me and the other guys. we held him to the ground until he couldn't move".
Police said all the casualties were Muslims.
- Police say they believe there was only one man in the van.
It said searches were being carried out at a residential address in the Cardiff area in Wales.
- The suspect was not "on the security services'" radar, Home Office Minister of Security Ben Wallace said.
Other US officials and agencies have more consistently condemned violent attacks - regardless of the circumstances. Eight are in the hospital.
The 47-year-old man was arrested for attempted murder after the incident in Finsbury Park early Monday.
He has been arrested for the commission, preparation or instigation of terrorism including murder and attempted murder.More news: German lobby calls for fast Brexit deal on trade
Cardinal Vincent Nichols of Westminster has offered prayers for the victims of a terror attack in north London that targeted worshippers outside a mosque in the early hours of Monday.
It was not clear if he died because of the attack.
The i has been told that the mosque, which acts as both a welfare centre and a prayer hall for a Muslim community largely from north and eastern Africa, had received at least four letters containing threats or abuse in the last three years, including an envelope containing white powder created to cause anxiety and alarm.
Labour leader Jeremy Corbyn said, "An attack on a mosque, an attack on a synagogue, an attack on a church is actually an attack on all of us".
AHMED: We're human beings just like all of you other people are. The attack at about 00.20 on Monday appears to represent a disturbing development in recent terrorist incidents with a white attacker singling out Muslims. "It seeks to drive us apart and to break the precious bonds of solidarity and citizenship which we share in this country", May said. They will not succeed, and we will not let them.
The tragedy comes during the Muslim holy month of Ramadan and follows three terror incidents in Britain in as many months.
In a telephone interview with ITV News, Ms Osborne said she only found out her son was in custody after seeing images of him broadcast on television.
"Some big van. crushing the people in the mosque".
Both Warfa and Sulaman said there were three people originally in the van, and that two had run away.More news: Philippines launches offensive in hope of recapturing Marawi by weekend festival
This was the fourth terror attack in the United Kingdom in as many months, but the British people seem just as resilient as before, clearly demonstrated by the message from staff at the Finsbury Park Underground Station: "Tough Times Don't Last". He was detained by members of the public until police arrived, the Metropolitan Police said.
Hannah Jenkins, 23, who works in the local Spar shop, said: "I think everyone is in shock".
Pictures of the van indicated it was rented from Pontyclun Van Hire, northwest of Cardiff.
One of his former neighbours in Weston-super-Mare, who did not wish to be named, said: "We all know Darren, from our youth generally. Everyone said she was too good for him".
The cardinal also wrote to Mohammad Kozbar, trustee of the Finsbury Park Mosque, saying, "I am horrified that people should, again, be targeted in this way". Police there are treating it as a terror attack.
The attack occurred outside the Muslim Welfare House, a small mosque with about 200 congregants.
In late May, a suicide bomber killed more than 20 people after a concert in Manchester.
May said her government would "stop at nothing" to defeat extremism.More news: Georgia race finally heads to voters; DC watching closely
"None of us have ever really spoken to him, but we recognised him straightaway when we saw him on the telly this morning".
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