Parliament's website has been offline this morning following another threat from internet activist group Anonymous.

The website, which media reports say has been available sporadically over the past few days, was back online by 12.30pm.

The website of NZFACT, which represents the movie industry and supports copyright protections, is also down.

Anonymous posted a video on YouTube earlier this week claiming it had shut down the Parliament website in protest against recent changes to New Zealand's law and would continue to attack Government websites.

Anonymous said in the video it had been watching the Government.

"We are disappointed with many of your decisions. you should know by now that we do not sit around and watch people get their internet freedoms and rights taken away."

Repeat online copyright offenders can be fined up to $15,000 under the new law, which also gives the Government the power to introduce internet account suspension as a penalty.

Anonymous had threatened to take down the website last month, but that flopped.