Instructions educating Chinese citizens on how to sabotage the Melbourne International Film Festival are being circulated around the world, organisers say.
In the latest attack on the festival's website, online ticket sales were shut down after Chinese hackers on Saturday booked out all film sessions through to next Thursday.
It is not the first time hackers have broken into the website, but the first occasion ticket sales have been compromised.
Hackers replaced festival information with the Chinese flag and anti-Kadeer slogans soon after the launch of the 2009 festival.
Six Chinese-language movies have also been pulled out of the festival, leaving organisers with a logistical headache and the fear that Chinese film- makers will boycott the festival in future.
The hijacking comes as part of a mounting campaign against the festival's screening of The 10 Conditions of Love, a documentary about exiled Uighur leader Rebiya Kadeer.
China has accused Kadeer of being behind this month's violence between Muslim Uighurs and Han Chinese in China's western Xinjiang region that left nearly 200 people dead.
Kadeer has denied instigating the riots.
Festival director Richard Moore told AAP he had been alerted by a minority Chinese student living in the US that instructions on how to sabotage the festival were travelling fast.
'It's a very, very concerted and pointed attack,' Mr Moore said.
'Everyone's watching this - it's totally global.'
The email provides instructions for loading tickets into 'shopping carts' from the festival's website, and Chinese are being urged to teach others how to 'purchase' MIFF tickets online.
The circulating email reasons MIFF should be sabotaged 'because the festival invited Kadeer'.
Online sales represent 65 per cent of all tickets bought, Mr Moore said, with the weekend being the period of 'maximum traffic'.
'We knew there would be another attempt,' he said. 'There will be a decline in sales as a result.'
Kadeer is scheduled to attend a question-and-answer session after the screening of The 10 Conditions of Love on August 8.
Security remains a priority, organisers say. 'We've been in constant liaison with the police. We're monitoring it,' Mr Moore said. Film buffs can still buy tickets at the festival's box office or over the phone