Tunisian President Beji Caid
The Tunisian prime minister's communications adviser Dhafer Neji said: "Just as there have been security failures, there have also been political failures."
He said those fired included the governor of the Sousse region where the June 26 attack took place, as well as police officials.
Among the policemen dismissed were three from Sousse, one from Gaafour, the home city in the northwest of the jihadist who carried out the attack in Port El Kantaoui, and one from Kairouan where Rezgui was studying.
Interior ministry spokesman Mohamed Ali Aroui confirmed that "several (police) officials have been dismissed at Sousse and Kerouan," including the chief of the Sousse region.
Seifeddine Rezgui
The security forces were criticised after the attack for not reacting quickly enough, after witnesses said at least 30 minutes elapsed before police arrived.
On Friday, the authorities admitted for the first time that there had been security failures, with Prime Minister Habib Essid saying: "The time of the reaction - this is the problem."
Tunisia's president declared a state of emergency on Saturday.
President Beji Caid Essebsi said that an "exceptional situation required exceptional measures".
Mr Essebsi, however, pledged to respect freedom of expression.
http://www.youtube.com/watch?v=ynHIlx5RgtI
Members of the Tunisian Security Services stand guard on the Sousse beach
"Tunisia faces a very serious danger and it should take any possible measures to maintain security and safety," he said. "As we see in other countries, if attacks like Sousse happen again, the country will collapse."
Mr Essebsi blamed the poor security in Libya for Tunisia's problems, and the lack of international resolve in targeting the Islamic State group throughout the region.
On Friday Britain held a minute's silence across the country to remember the victims of the previous week's terrorist attack.
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