Cairo (CNN) -- Egyptians exulted Wednesday over the detention of their ailing former president and his two sons in a probe exploring the killing of protesters in Cairo's Tahrir Square, the center of the country's dramatic uprising earlier this year.

Former President Hosni Mubarak and his sons, Gamal and Alaa, were taken into 15-day detainment Tuesday in connection with the protesters' deaths, according to Ahmed Hemeida with the Justice Ministry.

Mubarak has decried accusations of his responsibility in the deaths, saying the probe is aimed at tarnishing his reputation and that of his family. The detention and questioning of the former authoritarian leader is unprecedented in the modern Arab world. Saddam Hussein, Iraq's late leader, was captured by U.S. troops and put on trial after his regime was toppled more than eight years ago.

But Mubarak's case is different because his detention didn't involve the West. In contrast to Saddam's case, the government made the arrest amid domestic demands that he be held.

People on the street in Cairo saw the arrest as a positive sign. One smiling taxi driver stopped in traffic, crossed his wrists in front of himself as if he was handcuffed and yelled "Mubarak 'cuffed!'" in Arabic.

Mahmoud Amreya, who cooks chicken and beef shawarma sandwiches over a hot grill, beamed. "I am very happy," he said.

Ahmed Abdulsalem, an accountant in a coffee shop, said Egypt "has taken a big step forward" with people regaining their dignity.

"In the previous regime corruption gave way to more corruption. And it was survival of the fittest," he said. "Corruption. The country was spiraling downwards from bad to worse, in all cases. What we are living today is much better than what it was under the oppressive regime."

The developments came a day after the former president -- who earlier was summoned for questioning on corruption allegations -- was admitted to a hospital after complaining to his doctor that he felt unwell.

Egyptian state television reported Mubarak suffered a heart attack during questioning over possible corruption charges.

But Egypt's health minister, Ashraf Hatem, later said that Mubarak's condition was stable enough to allow prosecutors to resume questioning at the hospital, according to the state-owned Al Ahram newspaper.

However, there were conflicting reports on Wednesday about Mubarak's precise whereabouts and grim reports about his health.

Mubarak remained at the Sharm el-Sheikh International Hospital and is in "unstable" condition, the state-run MENA news agency reported Wednesday, citing a medical source. State TV reported that Mubarak is suffering from a "nervous breakdown" and might be transferred to a hospital in Cairo.

But Alla Mahmoud, an Interior Ministry spokesman, told CNN that Mubarak was flown by helicopter to a hospital in Cairo on Wednesday.

The younger Mubaraks have been transferred to Cairo's Tora Prison, Hemeida said.

Mubarak and his family were believed to have been living on his estate in the Red Sea resort since February 11, when he stepped down and handed power to the military.

In response to accusations that his family had grown wealthy at the expense of the Egyptian people, Mubarak, in a brief audio message aired Sunday, promised he and his family would account for everything they own. He said he agreed to allow the prosecutor to contact governments around the world to take "proper legal steps" to reveal whether he or his family own any property or real estate outside Egypt.

Mubarak was brought to Cairo for questioning last month, and Egypt's attorney general issued an order to freeze the assets of him and his family, and prohibited them from leaving the country.

Mubarak had back surgery in Germany in 2004 and returned there in 2010 to have his gall bladder removed. He had largely withdrawn from public view in recent years, until this year's uprising prompted him to make televised speeches.

Mubarak ruled Egypt for nearly three decades. His regime was toppled by a groundswell of popular protests that began January 25.

On the street, meanwhile, Mohamed Gafar, a taxi driver, said that because of Mubarak's detention he is seeing a wellspring of joy from his perch, what he calls "happiness beyond imagination."

"The man that used to put people in prison is now behind bars." he said. "They were the rulers of the country and today, with God's will, where are they? In prison. In prison. Oppression has an end. Every oppressor has an end."

CNN's Samson Desta, Caroline Faraj, Ivan Watson and journalist Mohamed Fadel Fahmy contributed to this report