The Australian Parliament website has again been shut down by hackers protesting against the Federal Government's plans to block certain internet sites.

The website and another linked to the Department of Broadband and Communications were shut down for long periods yesterday after their servers were overloaded.

Both websites were offline again this morning.

A group of hackers calling itself Anonymous has claimed responsibility for the interruptions, which it has called Operation Titstorm.

Anonymous claims the attacks are also to highlight moves by the Government to ban the import of pornograhy featuring female ejaculation as well as small-breasted women over fears such films were simulating child pornography.

Critics say the Government's internet filter amounts to censorship and will slow down internet speeds.

The Government says the filter is necessary to block websites containing child pornography and other criminal activity.