Greece is slipping into a "danger zone" without the funds or resources to handle a fast-growing wave of refugees trying to enter the European Union from war-torn countries like Syria and Iraq, the government warned on Thursday.

A surge in people fleeing violence in Africa and the Middle East has increased the pressure on the eurozone's most indebted country, a major gateway into the EU for migrants who attempt risky boat crossings through porous sea borders.

The latest influx was driven mainly by wars in Syria, the Gaza Strip, Libya and northern Iraq, Shipping and Maritime Minister Miltiadis Varvitsiotis told reporters.