German internet security experts declared victory on Monday in a bid to head off a computer virus before it spreads through millions of personal computers worldwide. Sober.P, a computer worm that sent neo-Nazi German-language e-mails onto hundreds of thousands of computers last week, had been programmed by its unknown author to cease activity on Monday and seek reinforcement with new code hidden around the internet. Virus-hunters funded by the German government decided to block the reinforcements by closing down web computers supplying the code. "Nothing has happened so far today," said Michael Dickopf, a spokesman for the Federal Office for Security in Information Technology (BSI). "Our defensive actions appear to have worked." The BSI analysed the worm last week and won help from internet service providers to take down all offending websites. Without access to the code it needs, Sober was expected to remain dormant on infected personal computers.