Thousands of high school students are retaking part of their baccalaureate exams after details of earlier papers were shared on the internet, according to state media.

An official source quoted by the APS news agency said: "The cut in social media is directly related to the partial baccalaureate exams that are taking place on Sunday.

"This is to protect students from the publication of false papers for these exams."

The country's 3G mobile network also appeared to be disrupted on Sunday.

Earlier this month police arrested dozens of people - including officials working in national education offices and printers - to find out how parts of the 2016 high school exams were leaked.