NPR:

Escalating political violence from both the left and right is raising fears of political instability in debt-burdened Greece. The conservative-led government is cracking down on leftist groups, vowing to restore law and order.
But the opposition says authorities are trying to divert people's attention from growing poverty and despair.
Take the latest explosion in Athens — a firebomb at a crowded suburban mall last month that slightly injured two security guards.
Officials described it as a revival of the full-scale leftist terrorism that plagued the country in past decades. A government spokesman said the attack is "a blow to democracy and attempts to restore economic growth."