The PBS Web site briefly carried a fake article claiming that the famed rapper Tupac Shakur was alive and living in New Zealand after a group of hackers took over the organization’s computer systems on Saturday night.

In addition to posting the fake news article, the group, which identified itself on Twitter as @LulzSec or The Lulz Boat, began posting passwords and e-mail addresses of people from a wide range of news organizations and other information belonging to PBS.

As late as 2:30 a.m. on Monday, PBS had still not regained control of its Web site as the hackers continued to post defaced pages.

Comments posted by LulzSec indicated that the group was unhappy with a Frontline program about WikiLeaks that was recently shown on PBS. The group began posting messages on Twitter about midnight on Sunday: “What’s wrong with @PBS, how come all of its servers are rooted? How come their database is seized? Why are passwords cracked?” That message was followed by a succession of posts with links to lists of passwords and other data.