SYDNEY, Australia — The Australian Parliament said on Friday that hackers had tried to break into its computer network, which includes lawmakers’ email archives, but that so far there were no indications that data had been stolen.

“Following a security incident on the parliamentary computing network, a number of measures have been implemented to protect the network and its users,” Parliament’s presiding officers, Tony Smith and Scott Ryan, said in a joint statement. “All users have been required to change their passwords. This has occurred overnight and this morning.”

“There is no evidence that any data has been accessed or taken at this time, however this will remain subject to ongoing investigation,” the statement read.

Australian news outlets reported that security agencies were investigating the possibility that a foreign government was behind the attack, possibly China’s.