Georgia prime minister found dead
Mr Zhvania, 41, was once an ally of former President Eduard Shevardnadze.
But he turned against him and played a prominent role in the 2003 Rose Revolution that ousted Mr Shevardnadze.
Interior Minister Vano Merabishvili said Mr Zhvania had arrived at the flat at about midnight local time on Wednesday (2100 GMT).
Security guards became suspicious after the prime minister failed to answer his phone for several hours.
Georgia will stand firm, and I hope I will stand firm because it is firmness that we need the most at present Mikhail Saakashvili, Georgian President
They broke in around 0400 to find Mr Zhvania dead in an armchair.
The body of his friend and the owner of the flat, named as Kremo-Kartli region deputy governor Raul Usupov, was found in the kitchen.
No foul play was suspected, Mr Merabishvili said, but the body had been taken to the coroner's office for further examination.
David Morchiladze, the general director of Tbilgaz - the company supplying gas to Tbilisi - said there was an Iranian-made heater installed in the flat which broke safety regulations.
"Carbon monoxide was bound to be collected in the flat," he said. His deputy added that the flat, which Mr Usupov had moved into only a few weeks ago, had no vent for the gas.
Georgian President Mikhail Saakashvili held an emergency government meeting which was shown live on Georgian television.
"Georgia has lost a great patriot whose entire life was devoted to tireless and selfless service to our country. I have lost my closest friend, most trusted adviser and greatest ally," Mr Saakashvili said, addressing his ministers.
"I hope you will stand firm, Georgia will stand firm, and I hope I will stand firm because it is firmness that we need the most at present."
Mr Saakashvili said that his thoughts were with "Zurab's wife Nino, his mother Rema and his three most beautiful children".
Another Rose Revolution leader, parliamentary speaker Nino Burjanadze, cut short her visit to Italy and is returning to Georgia.
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39 Congresso (I sessione)
39° Congresso (prima sessione) del Partito Radicale Nonviolento Transnazionale e Transpartito. Le mozioni approvate
Sostegno all’appello del Presidente Chirac e del Presidente Diouf, Sauver Tombouctou pour sauver la paix / Saving Timbuktu to save the peace.
Senato del Partito Radicale
Roma, 8/9 febbraio 2014
- dall'intervento di Maurizio Turco, Tesoriere del Partito Radicale (pdf)
- Il dibattito dell'8 e 9 febbraio [primo giorno] [secondo giorno]
Roma, 14 dicembre 2013