Khalistan Referendum voting was hit by a massive cyber security attack within 30 minutes of the start of the voting.

The voting started at the Brisbane Exhibition and Convention Centre with the Sikh holy prayers at sharp 9am. 

The voting continued smoothly for the first 30 minutes but then the whole voting electronic system crashed as the cyber-attack was launched.

Organisers Sikhs For Justice said the attack was well planned and well-coordinated.

They said that the Indian government agencies were behind the cyber-attack.