Shares on the Athens Stock Exchange are again suffering heavy losses after officials in the governing coalition conceded they were still short of the support needed to stop the government collapsing in a parliamentary vote this month.

In late afternoon trading Thursday, shares were down nearly 8 percent, while the yield on Greece's 10-year-bond jumped to nearly 9 percent.

Despite recently emerging from recession, the country was thrown back into uncertainty this week, when conservative Prime Minister Antonis Samaras called an early vote in parliament to elect a new president — despite requiring support from opposition lawmakers to avoid a stalemate.

The deputy trade minister, Gerasimos Giakoumatos, in a radio interview Thursday said "at the moment we do not have the numbers."