An al-Qaeda plotter who planned to kill thousands of people in Britain and the United States has been sentenced to life
Dhiren Barot, 34 and from London, had admitted conspiracy to murder.
The prosecution told Woolwich Crown Court Barot intended a "memorable black day" of terror and considered using a radioactive "dirty bomb".
Mr Justice Butterfield said the plot could have seen carnage on a "colossal and unprecedented scale" if successful.
Barot, a former Hindu who converted to Islam, is also wanted by US authorities over charges of conspiracy to use weapons of mass destruction in the US and in Yemen.
The judge told him: "This was no noble cause. Your plans were to bring indiscriminate carnage, bloodshed and butchery first in Washington, New York and Newark, and thereafter the UK on a colossal and unprecedented scale."
Home Secretary John Reid said the case showed "the terrorist threat remains very real and serious".
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