A 47-year-old father of four, Darren Osborne, was named in the British press as the man arrested on suspicion of ploughing a van on Monday into a group of Muslims in London.
Security Minister Ben Wallace said the suspect was not known to the security services and was believed to have acted alone.
A van plowed into worshippers near a London mosque in the early hours of Monday, injuring 11 people, two of them seriously, in what Prime Minister Theresa May said was a sickening, terrorist attack on Muslims.
Ali Habib, a 23-year-old student, said residents are angry that the mosque attack hasn't been portrayed in the same light as the other attacks across the country. Witnesses alleged he tried to escape after the attack, shouting: "I want to kill Muslims - you deserve it", and "I did my bit".
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Varadkar said he would emphasize to May the British and Irish governments must remain impartial in Northern Ireland, as stipulated by the Good Friday Agreement.
After meeting faith leaders at Finsbury Park Mosque on Monday afternoon, she said: 'The awful terrorist attack which took place last night was an evil borne out of hatred and it has devastated a community'.
Metropolitan Police Deputy Assistant Commissioner Neil Basu said police are investigating whether the death of the man getting first aid was a direct result of the attack, but it was too early to say for sure.
It said searches were being carried out at a residential address in the Cardiff area in Wales. "We've made it very clear to our British allies that we stand ready to provide any support and assistance that they may need", White House spokesman Sean Spicer told reporters at a briefing. A Sky News producer at the scene said the crash took place shortly after midnight local time as worshipers were leaving the Finsbury Park Mosque at midnight Ramadan prayers. The Guardian reported that 10 people were hurt, three of them seriously.
She added: "I saw a lot of people injured".
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London Mayor Sadiq Khan has called on her to reverse planned police spending cuts.
Britain's terrorist alert is set at "severe", meaning an attack is highly likely, Sky News reported.
Manchester was also hit on May 22 when a suicide bomber killed 22 people at an Ariana Grande concert. In the past decade, the mosque has transformed its image from one associated with radicalization to one that advocates interfaith harmony.
A witness told CNN's Phil Black the van "came to a stop, and that's when they were able to apprehend the driver. they were able to pull him out". Attendance has greatly increased since then among worshippers from various communities, according to the mosque's website.
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