AFP: The United States delivered a chilling warning Monday that Al-Qaeda's interest in nuclear weapons was still "strong" and said the risk of nuclear terrorism was "real," "serious" and "growing." American officials said ahead of a 47-nation nuclear security summit here that there was intelligence that Osama bin Laden's group was continuing to pursue its "murderous agenda" by trying to obtain weapons of mass destruction. But they did not characterize that intelligence, or disclose whether Al-Qaeda was making progress in stealing unsecured enriched uranium and plutonium stocks or was active on the nuclear black market.