Updated

U.S. Ambassador Nikki Haley is urging South Sudan's leaders to seize "the last chance" to salvage the 2015 peace agreement and end the worsening violence that has forced 4 million people to flee their homes and left 7.6 million in desperate need of aid.

Haley told the U.N. Security Council on Tuesday that "the people of South Sudan are suffering and the promise of their hard-fought independence is slipping away."

She called on the opposing parties to commit themselves to the revitalization process put forward by the East African regional group, IGAD, "to resuscitate the peace agreement — and to do so quickly for time is running short."

Haley's appeal to the parties was echoed by nearly all council members and U.N. special envoy for South Sudan David Shearer.