"This morning we have seen a sickening attempt to destroy those freedoms, and to break those bonds of citizenship that define our United Kingdom," she said in a news conference. "It is a reminder that terrorism, extremism and hatred take many forms, and our determination to tackle them must be the same whoever is responsible."
The attack, in which all victims were Muslim, left one dead and 10 injured. It's suspected to be the third terror incident in London where a van has been used to ram pedestrians.
Update, 4:00 a.m.: The BBC reports that a man has died and 10 people have been injured after a van mounted the pavement and struck a group of people outside the Muslim Welfare Center near London's Finsbury Park Mosque.
This story was originally published on June 18, 2017.
Metropolitan Police say that they've arrested one suspect and report there are "a number of casualties being worked on at the scene."
London Ambulance has also tweeted a message stating they've "sent a number of resources to an incident in Seven Sisters Road" and that they'll share more details as they acquire more information.
"We have been informed that a van has run over worshippers as they left #FinsburyPark mosque," the Muslim Council tweeted from its official handle. "Our prayers are with the victims."
BuzzFeed News also reported that the incident took place near the Finsbury Park Mosque, "where prayers were scheduled to be held shortly before 11 p.m." Muslims are currently celebrating Ramadan, the 29-day holiday which ends this year on June 24.
At this time, authorities have not released a clear explanation of the night's tragic events, which are the latest in a string of violence and horror in England, with terror attacks at a concert in Manchester and on a London bridge and a horrific blaze at Grenfell Tower Apartment that has reportedly killed at least 58 people.
This is a developing story.