President Obama’s national security adviser demanded Sunday that Pakistan let American investigators interview Osama bin Laden’s three widows, adding new pressure in a relationship now fraught over how Bin Laden could have been hiding near Islamabad for years before he was killed by commandos last week…

As one American official said after Mr. Donilon spoke Sunday: “Our guess is that the wives knew just who was keeping Bin Laden alive for all these years.” He added later, “It’s the Khan case all over again.” He insisted on anonymity as the United States tries to ease Pakistan’s anger over Mr. Obama’s decision to conduct the raid without telling Pakistani officials in advance, or seeking their involvement…

Pakistan has said it will conduct its own investigation, but American officials doubt it will be credible. For more than two years Pakistan has slow-walked investigations into the 2008 siege in Mumbai, India, by a terrorist group, Lashkar-e-Taiba, that is believed to have strong links to portions of the Pakistani intelligence apparatus. To the distress of Pakistani officials, a trial scheduled to start soon in Chicago is expected to reveal evidence about the role in that attack of an officer of the Inter-Services Intelligence, Pakistan’s main military intelligence agency.