Unidentified hackers installed child pornography onto the computer of Czech President Milos Zeman, the Pravo newspaper reported Monday.

"I turned on my computer and looked in disbelief for about 10 seconds at what was happening, before I realized that it was a hacker attack," Zeman said in an interview.

IT specialists from the president's office have traced the attack back to the US state of Alabama, the president said.

This is not the first cyber attack on Czech politicians. Hackers broke into the email account of the Czech Prime Minister Bohuslav Sobotka in early 2016. Previously, unknown users sent fake messages from his Twitter account.

In October 2013, pornographic photographs appeared on the website of Zeman's Party of Civic Rights (SPO).

Zeman is considered a critic of Islam and supports an end to EU sanctions against Russia. The 72-year-old plans to run for a second 5-year term in office early next year.