Moussaoui 'could have stopped 9/11 attacks'

US government prosecutors today argued that a terrorist conspirator who studied in London must be executed for causing the deaths of nearly 3,000 people by failing to tell what he knew of the September 11 attacks.

As Zacarias Moussaoui stroked his beard during his Virginia trial, and families of the September 11 victims watched on closed-circuit TV, prosecutor Rob Spencer described the horror of the 2001 attacks and laid blame on the only man charged over them.