Nigeria’s Independent National Electoral Commission (INEC) is investigating the recent hack of its website, it said on Twitter.
This is as Nigerians head to the polls to cast their vote for the country’s next president.
According to media reports, the website was struck by a group known as “Nigerian Cyber Army”.
The group warned officials not to rig the presidential election as accreditation for voting in the poll was under way.
"Strucked by Nigerian Cyber Army," read the banner at the top of the page, and underneath: "security is just an illusion."
The disabling of the website was not seen as interfering with the voting process.
The page featured a picture taken from a newspaper of candidates Muhammadu Buhari and President Goodluck Jonathan as football players and INEC chairman Attahiru Jega as referee warning them against "post match hooliganism".
"If you attempt to rig, you will pay," the message read.
Government websites are periodically hacked by ingenious Nigerians making use of creative grammar and punctuation to leave embarrassing messages.
The commission stated that it is aware of the hack and is currently investigating the incident, and urged voters to visit its Facebook page for information about the elections. The site has since come back online
- with additional reporting by Reuters