British Prime Minister Theresa May says her thoughts are with all those injured after a van rammed into worshippers leaving a mosque.
"This is a terrible incident," May said in an emailed statement. "All my thoughts are with those who have been injured, their loved ones, and the emergency services on the scene."
Earlier, Labour leader Jeremy Corbyn expressed his shock at what had happened, writing on Twitter: "I'm totally shocked at the incident at Finsbury Park tonight.
"I've been in touch with the mosques, police and Islington council regarding the incident. My thoughts are with those and the community affected by this awful event."
Chairman of the mosque at Finsbury Park Mohammed Kozbar tweeted: "Our thoughts and prayers with those who got injured and effected by this cowardly attack in Finsbury Park area, many casualties in the floor."