Hackers mounted an electronic assault on at least 11 U.S. military computer systems earlier this month, as the United States was stepping up deployments of troops and equipment to the Persian Gulf, this according to Pentagon officials, reported in The Washington Post today. The systems contain unclassified information, but the timing and magnitude of the assaults have alarmed U.S. authorities, although officials said no evidence has emerged that the intrusions were aimed at disrupting Gulf deployments or compromised preparations for possible military strikes against Iraq. Investigators have yet to determine their full impact.