The incident took place as worshippers were arriving for afternoon prayers.
As news filtered in, organisations from the Jewish community called for solidarity.
The Jewish Council on Racial Equality tweeted that they were “deeply saddened” by the attack. “We stand in solidarity with the Muslim community against extremist hatred,” they wrote.
The Board of Deputies issued a statement signed by President Marie van der Zyl which read: “Horrific news of a stabbing at Regent’s Park Mosque. Our hearts go out to the muezzin, his family and the Muslim community, and we pray for his swift recovery.”
“It appears that this may be another far-right terrorist attack. We call on leaders in Britain and the world to stamp out this heinous wave of racist hate that has reemerged. We must learn lessons from history, stop the spread of intolerance, and give it no quarter in our politics, media or society,” the statement said.
Left-wing Jewish group Yachad also tweeted that “we must stand together against all forms of extremism, bigotry and racism”.
Senior Jewish, Christian and Muslim figures had held an interfaith unity gathering at Regent's Park Mosque in January 2015.
