A supporter of the No vote waves a Greek flag after the first results of the referendum at Syntagma square in Athens, Sunday, July 5, 2015 (AP Photo/Emilio Morenatti)

Supporters of the No vote gather after the first results of the referendum at Syntagma square in Athens, Sunday, July 5, 2015 (AP Photo/Emilio Morenatti)

Supporters of the No vote react after the first results of the referendum at Klafthmonos square in Athens, Sunday, July 5, 2015 (AP Photo/Petr David Josek)

Supporters of the No vote react after the first results of the referendum at Syntagma square in Athens, Sunday, July 5, 2015 (AP Photo/Petros Giannakouris)

Supporters of the No vote wave Greek flags after the first results of the referendum at Syntagma square in Athens, Sunday, July 5, 2015 (AP Photo/Emilio Morenatti)

 Supporters of the No vote react after the first results of the referendum at Syntagma square in Athens, Sunday, July 5, 2015 (AP Photo/Petros Giannakouris)

Supporters of the No vote wave Greek flags after the referendum's exit polls at Syntagma square in Athens, Sunday, July 5, 2015 (AP Photo/Petros Giannakouris)

 A couple, supporters of the No vote, hugs each other after the referendum's exit polls in Athens, Sunday, July 5, 2015 (AP Photo/Emilio Morenatti)

A supporter of the No vote covers her face with a flyer reading ''No to submission'' at Klafthmonos square in Athens, Sunday, July 5, 2015 (AP Photo/Petr David Josek)