The Philippines ordered all government offices to tighten Internet security Sunday after its main information website was brought down by hackers.

"We are alerting all government agencies to review and improve security of their websites in view of the hacking of the Philippine Information Agency website this afternoon," presidential spokesman Herminio Coloma said.

The information agency website remained inaccessible late in the afternoon, with the words "Hacked by 7z1" appearing if searched for on Google.

Coloma did not say whether the hacker attack was related to widespread public anger over the police bungling of a hostage crisis one week ago that left eight Hong Kong tourists dead.

President Benigno Aquino's personal Facebook account has been flooded by hate messages over the incident, accusing his police force of incompetence.

AFP