Greek Radical Left leader Tsipras says he has failed to forge a coalition that would end the country's post-election deadlock.
Tsipras says that despite his best efforts since receiving the mandate on Tuesday, he was unable to raise enough support to form a government.
He says he will return the mandate Thursday to President Karolos Papoulias.
The 38-year-old's party was the surprise runner-up of Sunday's national elections, which hammered mainstream politicians but left no party with enough seats in Parliament to govern alone.
The mandate will now pass to the third-placed Socialists. If no coalition deal is reached, new elections will have to be held.
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