The US defence department has sent Congress the draft of a new manual for trying detainees at Guantanamo Bay.

The new rules would allow terror suspects to be imprisoned on the basis of hearsay or coerced testimony - if a judge ruled the evidence credible.

The draft follows new legislation establishing military commissions to try what the US calls enemy combatants.

Up to 80 of the 400 detainees at Guantanamo could face the military commissions, which are due to start soon.