A hacker group marred hundreds of Web sites with digital graffiti last night in an apparent response to the onset of the U.S.-led war against Iraq, prompting security experts to warn of further cyberattacks in the days to come.

Unix Security Guards, a pro-Islamic hacking group, defaced nearly 400 Web sites Wednesday evening with antiwar slogans written in Arabic and English, according to iDefense, a Reston, Va.-based Internet security firm.

Text posted on sites by the hacker group said the defacements were the beginning of "the new era of cyber war we promised! More is coming, just like the US do [sic] what it wants to the world, we will do what we want to the Internet. Stop the US terroristes [sic] and we will stop! Viva Iraq!"
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