Alleged Manchester bomb plotter Abid Naseer has told a court he only used chat rooms to "date and find a wife" and not to communicate with Al-Qaida.
It is claimed Naseer planned to blow up the Arndale Shopping Centre in a bid to carry out a "second 9/11".
A US court heard he used code words, such as wedding for "attack" and party for "explosion", with his co-conspirators to discuss the plans. His trial is expected to last up to four weeks.
ITV Washington Correspondent Robert Moore reports from Brooklyn:
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.