He questioned whether the two additional passports may have been diplomatic documents following indications from the Dubai authorities that diplomatic papers may have been used by some involved in the killing.

BBC: Urgent question

The intelligence analyst, who joined the US Army in 2007, is accused of leaking 720, 000 secret military and diplomatic US government documents.

BBC: Bradley Manning visit limits 'break UN probe rules'

Pte Manning has been widely named as the prime suspect, and in March 2011, the US Army charged him with 22 extra counts relating to the unauthorised possession and distribution of more than 720, 000 secret diplomatic and military documents.

BBC: Profile: Bradley Manning