In September of 2013, it was reported the US Navys largest unclassified computer network was hacked by a group either working directly for Irans government [or] acting with the approval of Iranian leaders. Now US officials say that the network infiltration was far more extensive than previously thought, and lasted much longer than previously reported. According to The Wall Street Journal, it took the Navy four months — until November 2013, after initial news of the hack was published in late September — to purge the hackers from the network. The Wall Street Journal says the hackers targeted the Navy Marine Corps Internet, and were able to access through a security gap in one of the Navys public-facing websites.