Tunisian President Beji Caid Essebsi is in hospital after a "serious health crisis".
They did not disclose any further details. Mr. Essebsi – who is the oldest sitting president in the world at the age of 92 – was also hospitalized last week.
Prime Minister Youssef Chahed said that Mr. Essebsi receives all the attention he needs and people should stop spreading "false news" about his condition.
There were reports that the president had died.
Mr. Chahed said in a Facebook post (in Arabic) that he had visited the President in the hospital.
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Mr Essebsi won Tunisia's first free election in 2014 after Arab uprisings across the region.
Earlier this year, he announced that he would not attend the November elections.
Former Tunisian President Zine el-Abedine Ben Ali was overthrown in 2011 after 23 years in office.
Since then, Tunisia has been praised as the only democracy that emerged from the revolutions of the so-called Arab Spring.
In recent years, however, the country has suffered from Islamist attacks and economic problems, with unemployment a continuing problem.
The day before, there were two suicide attacks on security forces in the capital Tunis.
Interior Ministry said they targeted a police patrol on one of the city's main streets. One officer was killed and another wounded with three civilians.
The second bombing in another neighborhood injured four people at the gates of a National Guard base.
It is not yet clear who is behind the attacks.