Pakistani citizen Abid Naseer has been found guilty of leading al Qaeda plots to launch bomb attacks in the UK and US.
The 28-year-old was accused of planning a terror attack on Manchester's Arndale shopping centre in 2009, along with an attack in New York.
He was found guilty of all three charges he faced after being tried in front of a jury at Brooklyn's federal district courthouse.
Naseer claimed he was an innocent and peace loving man who came to Britain for an education and a wife.
But the jury found him guilty of providing material support to a foreign terrorist organisation, conspiring to provide material support to a foreign terrorist organisation and conspiring to use a destructive device.
Prosecutors said Naseer's plot formed part of a three-pronged international attack, timed to coincide with strikes on the New York subway and a Danish newspaper.
After a most unusual trial in Brooklyn, jurors now must decide whether Abid Naseer plotted to blow up a Manchester shopping centre.
Osama bin Laden was sent letters updating him of the progress of terror cells in the UK, New York and Copenhagen, a US court has heard.
A man charged with drawing up plans to carry out terror attacks in Manchester, New York and Copenhagen is due to go on trial in the US.