International agencies plan to raise billions of dollars to tackle the worsening refugee crisis in the Middle East and North Africa by issuing new bonds to help displaced people and support reconstruction in the war-torn region.

The United Nations, World Bank and Islamic Development Bank announced the proposal on Saturday after global policymakers met to discuss ways to ease the growing humanitarian and economic crisis stemming from conflicts in countries including Syria, Iraq, Yemen and Libya.

World Bank President Jim Yong Kim said more than 15 million people had fled their homes, sending a massive influx of refugees into countries like Lebanon and Jordan.