A virus crippled the computer network in Western Australia's parliament, forcing the institution to close on Wednesday, reports said.
Lawmakers and the parliament staff members were handed a memo on Wednesday morning informing them that the cyber attack had infiltrated the network despite sophisticated firewall protection, local media said.
Computers and phones were isolated to prevent the trojan virus penetrating the system any further, Australian Associated Press said.
The website of the parliament was down due to the attack late Tuesday, and phone calls to the main switchboard were not connecting. The origin of the virus was not known.
"Currently IT staff are working jointly with external IT specialists on a solution to return the network to normal operating status," Rob Hunter, the parliamentary services executive manager, said, according to the West Australian newspaper website.