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.
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The prime minister was shouted at as she left the scene of the tragedy in which at least 79 people died.
Father-of-six Makram Ali, 51, was already receiving medical treatment as the attack unfolded. He died from multiple injuries, police say.
A review of how police and security services dealt with the latest terror attacks in the UK is to be launched, Amber Rudd has announced.