A spokesman for South Sudan rebels says the president's reservations about a peace deal he signed signal "a lack of commitment" to making peace.

James Gatdet Dak, a spokesman for opposition leader leader Riek Machar, said Thursday that while Machar is happy Kiir signed the compromise agreement, the long list of reservations cited by Kiir is worrisome.

The peace pact, designed with regional leaders mediating and backed by the international community, calls for a transitional government of national unity to be established within 90 days. Machar is expected to return to South Sudan's capital, Juba, as Kiir's deputy.

Even as Kiir signed the deal on Wednesday, the warring factions traded accusations over fresh violence in Unity state. There were no reports of fighting on Thursday.