Indian investigative agencies yesterday questioned a man they extradited from the United States and charged with being a "mastermind" of the deadly 2008 Mumbai siege.

India accuses Tahawwur Hussain Rana, 66, of being a member of the Pakistan-based Lashkar-e-Taiba (LeT) group, designated by the United Nations as a terrorist organisation.

Rana, a Pakistan-born Canadian, has denied all charges -- including waging war against India, conspiring to commit murder and acts of terrorism. He could face the death penalty if convicted.

New Delhi blamed the LeT group for the 2008 Mumbai attacks when 10 gunmen carried out a multi-day siege of the country's financial capital.