WASHINGTON, DC, USA (AP) — PBS officials say hackers cracked the public TV broadcaster’s website, posting a phony story claiming dead rapper Tupac Shakur was alive in New Zealand, and a group that claimed responsibility for the hacking complained about the network’s recent investigative news programme on WikiLeaks.

PBS confirmed early Monday morning on its official Twitter account that the website had been hacked. The phony story had been taken down as of Monday morning. It had been posted on the site of the PBS NewsHour programme, which is produced by WETA-TV in Arlington, Virginia.

The WikiLeaks report appeared on a different PBS show, Frontline.

Anne Bentley, PBS’ vicepresident of corporate communications, said in an email that erroneous information posted on the website has been corrected. The hackers also posted login information for two internal PBS sites: one that media use to access the PBS press room and an internal communications website for stations, she said. All affected parties, she added, were being notified.

David Fanning, executive producer of Frontline, said he learnt of the hacking early Monday, nearly a week after the programme aired its WikiSecrets documentary about the leak of US diplomatic cables to the WikiLeaks website. The documentary, produced by WGBH-TV in Boston, generated criticism and debate on the programme’s website in recent days from those sympathetic to WikiLeaks founder Julian Assange and from those who thought the programme was fair, Fanning said.

Frontline producers hear impassioned responses all the time, Fanning said. Having a group attack the PBS website over a news programme was unusual but “probably not unexpected”, he said.

“From our point of view, we just see it as a disappointing and irresponsible act, especially since we have been very open to publishing criticism of the film … and the film included other points of view,” Fanning said. “This kind of action is irresponsible and chilling.”

A tweet from the NewsHour Twitter account said: “If you missed it: our site has been accessed by hackers. Thanks for staying with us.”

A group calling itself LulzSec and ‘The Lulz Boat’ on Twitter claimed responsibility and posted links to other hacks, including a video apparently taunting the network. Taunting messages were also posted on the group’s Twitter page targeting Frontline. One message said the group recently saw the WikiSecrets show and was “less than impressed”.

The timing of the hacking was provocative: Sunday marked the one-year anniversary of the detention of Army Pfc Bradley Manning, who’s accused of passing thousands of classified documents to WikiLeaks.

PBS ombudsman Michael Getler wrote about the WikiSecrets documentary in his weekly column last Thursday, saying it had generated only a handful of complaints, though he had expected more mail from viewers.

“This may be a good thing for Frontline if it suggests that most viewers found the programme to be in keeping with Frontline’s reputation for fair yet tough reporting,” Getler wrote.

Getler raised some questions about the reporting in the programme but said he found the questioning by interviewer Martin Smith to be “tough but proper”