THE census website was shut down after being attacked by foreign hackers, the Australian Bureau of Statistics has revealed. “It was an attack,” chief statistician David Kalisch told ABC radio this morning. “It was quite clear it was malicious.” The ABS is now working with the Australian Signals Directorate to determine the source of the attack. Mr Kalisch said so far it had been very difficult to work out where it came from. In the past Australian government websites have been attacked by Chinese hackers.