Hackers identifying themselves with Antisec have attacked the website of Panda Labs' anti-malware products.
It follows yesterday's arrest of an alleged member of the movement alongside others linked to the Lulzsec hacking collective.
The site's front page was replaced with a message saying "Love to Lulzsec/Antisec fallen friends".
It accused the firm of having helped police arrest other hackers last month. The company denies the claim.
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