US officials have ordered a security review after hackers broke into the Senate website at the weekend.
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US officials confirmed that there is no individual user account information on the server supporting senate.gov that could have been compromised.
LulzSec posted files online which indicated it had been in the Senate network, but none of the files contained sensitive information.
The intrusion by LulzSec on the senate.gov network comes after the US recently said it would consider cyber attacks an "act of war", and reserved the right to respond to attacks with conventional means if they were found to have been orchestrated by a nation state.