Christine Lagarde has rejected suggestions that the IMF might postpone repayment deadlines for Greece (AP)

There are a number of threats on the horizon for a global economy still clawing back from the deepest recession in seven decades, world finance officials said.

A potential Greek debt default presents the most immediate risk, the International Monetary Fund's policy committee said.

After finance officials wrapped up three days of talks in Washington DC, the IMF set a goal of working toward a "more robust, balanced and job-rich global economy" while acknowledging growing risks to achieving that objective.

The Greek finance minister, Yanis Varoufakis, held a series of talks with finance officials on the sidelines of the spring meetings of the 188-nation IMF and World Bank, trying to settle his country's latest crisis.

Mario Draghi, head of the European Central Bank, said it was "urgent" to resolve the dispute between Greece and its creditors.

A default, he said, would send the global economy into "uncharted waters" and the extent of the possible damage would be hard to estimate.

He told reporters that he did not want to even contemplate the chance of a default.

Earlier in the week, IMF managing director Christine Lagarde rejected suggestions that her agency might postpone repayment deadlines for Greece.

Yesterday, she cited constructive talks with Mr Varoufakis and said the goal was to stabilise Greece's finances and assure an economic recovery.

They wanted to "make sure the whole partnership hangs together" between Greece and its creditors, she said.

In its closing communique, the policy-setting panel for the World Bank expressed concerns about the unevenness of global growth and pledged to work with the IMF to provide economic support for poor nations hit hard by falling commodity prices.

But Oxfam expressed disappointment that the IMF and World Bank did not devote more time to exploring ways to lessen widening income gaps.

"Given that rising inequality continues to make the headlines everywhere in the world, it is surprising how the issue remained almost totally absent from these spring meetings," said Nicolas Mombrial, head of the Washington office of Oxfam International.

Greece is in negotiations with the IMF and European authorities to receive the final 7.2 billion euro (£5.2 billion) instalment of its financial bailout.

Creditors are demanding that Greece produce a credible overhaul before releasing the money.

The country has relied on international loans since 2010. Without more bailout money, Greece could miss two debt payments due to the IMF in May and run out of cash to pay government salaries and pensions.

Fears that Greece could default and abandon the euro currency group sent shockwaves through global markets on Friday.

After being down nearly 360 points, the Dow Jones industrial average recovered a bit to finish down 279.47.

US treasury secretary Jacob Lew said that a Greek default would "create immediate hardship" for Greece and damage the world economy.

He urged South Korea, Germany, China and Japan to do more to increase consumer demand in their own countries instead of relying on exports to the US and elsewhere for growth.

"We are concerned that the global economy is reverting to the pre-crisis pattern of heavy reliance on US demand for growth," he Lew said.

"As we all know, such a pattern will not lead to strong, sustainable and balanced global growth."

The negotiations over Greece's debt have proved contentious but all sides have expressed optimism that the differences can be resolved.

A number of countries directed criticism at the US for the failure of Congress to pass the legislation needed to put into effect IMF reforms that would boost the agency's capacity to make loans and increase the voting power of such emerging economic powers as China, Brazil and India.

Agustin Carstens, who heads Mexico's central bank and chairs the IMF policy panel, said "pretty much all of the members expressed deep disappointment" that a failure of the US Congress to act was blocking implementation of the reforms.

The policy panel directed IMF officials to explore whether any interim reforms could be put into effect pending congressional action.

The finance ministers urged central banks including the US Federal Reserve to clearly communicate future policy changes to avoid triggering unwanted turbulence in financial markets.

PA Media