The United States has interviewed Osama bin Laden's three widows but did not say if they have revealed any useful information. The women were taken into custody after the raid on the Pakistan compound in which bin Laden was killed. Pakistan had initially refused US requests for access to the women. The Pentagon has, however, now confirmed that they have been questioned. The US has demanded an investigation as to how the al Qaeda chief could have lived for years in a city close to a top military academy and only 56 kilometres from Islamabad. It is thought the women could have vital information on the al Qaeda network and bin Laden's involvement in its operations.