Egypt's former president Hosni Mubarak is on life support after suffering a stroke, security officials told Reuters.
Egypt's state media reported earlier on Tuesday that Mubarak was "clinically dead."
"Former president Hosni Mubarak has clinically died following his arrival at Maadi military hospital on Tuesday evening," said Egypt's MENA.
"Mubarak's heart stopped beating and was subjected to a defibrillator several times but did not respond," MENA reported, according to Reuters.
There are conflicting reports from state media and security officials as to Mubarak's current health, as two security officials told Reuters that he is unconscious, not clinically dead.
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According to CNN's Christiane Amanpour, General Mamdouh Shaheen said Mubarak was "not clinically dead."
The Associated Press reported that Mubarak is on life support, citing security officials.
Earlier reports said Mubarak had suffered a stroke and was defibrillated. An Interior Ministry spokesman said Mubarak had been moved from prison to a military hospital as his condition worsened, according to CBS News.
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Mubarak's health had been deteriorating since he was deposed last February. He was serving a life sentence for his role in the deaths of protesters after being sentenced on June 2.
Mubarak's 30-year rule ended last February after an 18-day uprising forced him from power, sparking months of political turmoil, according to MSNBC.
Mubarak's lawyers said his health was "very critical" but his critics said reports of his illness were being exaggerated to win sympathy, MSNBC reported.
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According to the Sudden Cardiac Arrest Foundation, when someone suffers a sudden cardiac arrest their "heartbeat stops abruptly and unexpectedly" and unless they receive help, they are "clinically dead."
The news reports came as tens of thousands protested in Tahrir Square against the ruling military council's move to assume new powers, said the BBC.
GlobalPost's Kristin Deasy in Cairo said Tahrir Square was clearing out and there was minimal reaction among the crowds to reports of his death.
GlobalPost's Erin Cunningham, also in Cairo, is tweeting live: