Police said a man who was driving the auto has been arrested and taken to a.
Officers were called at 12.20 BST and are at the scene with other emergency services, the Metropolitan Police said.
"Al-Azhar affirms its total rejection of this terrorist, racist, sinful act, calling on Western countries to take all precautionary measures to limit the phenomenon of Islamophobia", it said in a statement.
An imam has been widely praised for helping to protect an attacker who mowed down people near a mosque in north London.
-The Finsbury Park Mosque "condemns in the strongest terms" a "heinous terrorist attack" early Monday, according to a statement released by the mosque Monday. A vehicle struck pedestrians near a mosque in north London early Monday morn.
Mr Basu added: "The attack unfolded whilst a man was receiving first aid from the public at the scene; sadly, he has died".
Prime Minister Theresa May described the attack as a "sickening" attempt to destroy liberties that unite Britain, such as freedom of worship.
"There were a group of brothers who were calm and collected and managed to calm people down and to extinguish any flames of anger or mob rule that would have taken charge had this group of mature brothers not stepped in", he said. The van had hit people assisting an elderly man who had collapsed, and who later died.
"Given we are approaching the end of the month of Ramadan and the celebration of Eid with many Muslims going to local mosques, we expect the authorities to increase security outside mosques as a matter of urgency".
"Our community is in shock", he said, urging people attending prayers to remain vigilant.
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But Kacimi said there was no need for the Muslim community to panic, because police and government officials have been "very, very supportive".
Radical Islamists have committed several attacks using vans and other vehicles and hitting pedestrians; this hate-filled maniac made a decision to do the same to Muslims coming out of a mosque.
He became, quite literally, what he thought he was fighting, the kind of murderous lunatic who tries to kill as many people as possible in the name of a cause. All of the casualties were Muslims, police say.
One person has been arrested following the incident on Seven Sisters Road in Finsbury Park.
Mr Javid said: "The perpetrator of this attack - and those awful attacks that we saw recently in Manchester and London - their intention is to seek to divide society".
Both Warfa and Sulaman said there were three people originally in the van, and that two had run away. "I don't think people understand how much these attacks affect all of us". However, the mosque was shut down and reorganized and has not been associated with radical views for more than a decade.
The scene is just metres from the main railway line linking London with Edinburgh, the main Arsenal Football Club shop and what was the Rainbow Theatre, considered the prestige London concert venue in the 1960s and 1970s.
Britain's terrorist alert has been set at "severe", meaning an attack is highly likely.
The incident follows only weeks after three Islamic attackers drove a van into pedestrians onLondon Bridge and then went on a knife rampage through busy Borough Market, killing eight people.
Today's attack his is the fourth terror attack in the United Kingdom in four months, after incidents in Westminster, Manchester and on London Bridge.