Abu Hamza could face life imprisonment after being found guilty of all charges in his New York trial.
A jury of eight men and four women found the cleric, 56, guilty on all 11 counts he faced, handing Manhattan U.S. Attorney Preet Bharara his second high-profile terrorism conviction in three months.
The imam was extradited from the UK in 2012 after a series of court battles with the British government.
More top news
Nigel Farage warned on Friday Britain was "far less safe" and exposed to Cologne-style sex attacks because of open-door immigration.
Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Two brothers have been arrested on suspicion of murder after their parents were found dead in their own home over the weekend.