International donors promised Somalia 1.8 billion euros ($2.4 billion) in reconstruction aid on Monday to back a three-year plan aimed at strengthening the country's economy and building up its fragile security.

Somali leaders and about 50 international delegations met in Brussels to endorse the plan, which includes steps to boost output, foster political dialogue and improve day-to-day security after decades of debilitating civil war.

The 28-nation European Union, already the largest donor to the horn of Africa country, led the financial pledges, committing 650 million euros.

"I am glad to note that pledges today reached 1.8 billion euros, backing with financial means these new priorities and framework," European Commission President Jose Manuel Barroso told the closing session of the conference.

Somalia plunged into two decades of civil war and lawlessness after the overthrow of President Siad Barre in 1991.

But donors have seen signs of stabilisation since the African Union's peacekeeping troops helped drive Islamist out of the capital Mogadishu and many other strongholds in central and southern Somalia.

The country of 10 million people is one of the poorest in the world, with per capita income of just $600 a year.