The force, consisting mainly of soldiers from neighbouring Senegal, was first sent to the small country in January to compel longstanding president Yahya Jammeh to relinquish power to his elected successor Adama Barrow.
At a weekend summit in the Liberian capital Monrovia, the 15-nation body commended the "crucial role" played by the mission in keeping The Gambia secure but leaders took note of "the fragile situation" in the country and extended the mission for 12 months.
They also broadened the mandate of the force known as ECOMIG to include support for training Gambian armed forces and urged other ECOWAS members to contribute additional troops.
After mediation by Guinea and Mauritania, strong regional pressure and the arrival of Senegalese troops, Jammeh went into exile in Equatorial Guinea on January 21, leaving the way clear for Barrow, but the departed ruler still enjoys a degree of support.
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The ECOWAS statement issued overnight yesterday made no mention of tension between the foreign troops and Gambian protesters who have called them "an occupying force", notably in Jammeh's native region about 100 kilometres east of the capital Banjul.
The regional leaders urged Barrow to establish the required framework and mechanism that will promote national dialogue and reconciliation, and render justice to past injustices, and strict respect to international norms and principles.
The Gambia is a sliver of land running across Senegalese territory from east to west either side of the Gambia river with Banjul located on the broad estuary giving on to the Atlantic.
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