(CNN) -- Planned Parenthood says its website was taken down Wednesday afternoon in what it called an "extremist" attack.
The group says the site was taken down through a distributed denial of service. That's when hackers flood a site with traffic to keep users from accessing it.
No one has claimed responsibility for the hack.
The incident comes following the release of several undercover videos that appear to show Planned Parenthood officials discussing the sale of fetal tissues and organs.
The footage, which is highly edited, was released by anti-abortion activists..
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