Greek Prime Minister George Papandreou early Tuesday warned fellow EU leaders to end division over the bloc\'s sovereign debt crisis with a "resonant" message to sceptical markets.

Masks hung by protesters hang at the occupied central Athens Syntagma square, opposite of the Greek Parliament.

"There is no room for indecision and mistakes... such as allowing cacophony to substitute for a common agenda and create more panic than security," Papandreou said in a letter to Luxembourg counterpart Jean-Claude Juncker, head of the 17-nation group of countries that share the euro.

"Today, there is a greater need to avoid the mistakes of the past...a strong and visionary European leadership is called for," Papandreou said.

The letter was released by his office as eurozone finance ministers huddled for emergency talks in Brussels and European stock markets tumbled amid fears of debt contagion to Italy and Spain, the EU\'s third and fourth economies.

"It is necessary this time to reach an efficient solution that will guarantee...debt viability, access to markets and the provision of means to restart growth in the Greek economy," the Greek premier said.

"The Eurogroup must send a resonant message that there is a strong willingness to support Greece\'s ambitious programme of change," he said.