Greeks Vote in bailout Referendum.

Millions of Greeks are voting in a crucial referendum on whether to accept the terms of an international bailout.

Polling stations opened at 07:00 local time (04:00 GMT), with the first results expected on Sunday evening.

The end of a frenetic week of campaigning saw huge rallies being held by both sides of the referendum on Friday.

The government has urged voters to vote "No", but opponents warn this could see Greece ejected from the euro zone.

Greek PM Rejects Euro Exit fears as he rallies "NO" Vote:

His typically charismatic turn on the stage came as the latest polls suggested that Sunday´s plebiscite was too close to call, with his EU nation of 11 million people evenly divided.

Countering EU leaders´ warnings that a "No" could cause Greece to crash out of the eurozone, Tsipras told the crowd of 25,000 cheering supporters: "We are not simply deciding to remain in Europe -- we are deciding to live with dignity in Europe.

"I call on you to say ´No´ to ultimatums and to turn your back on those who would terrorise you," the 40-year-old leader said. "No one can ignore this passion and optimism."

Just 800 metres (yards) away, separated by police with riot shields, a rival rally of 20,000 "Yes" supporters shouted pro-European slogans and voiced fears of a so-called Grexit if Tsipras got his way.