South Sudanese rebels accused the army of attacking their positions today just hours before a ceasefire deal agreed by the government and rebels comes into effect.
Rebel spokesman Lul Ruai Koang said "simultaneous attacks have been launched" by the army on rebel positions in the northern oil state of Unity, and in the volatile eastern Jonglei region.
But army spokesman Philip Aguer said he had "no reports of fighting", and that clashes in Jonglei had taken place before the deal was signed, when rebels attacked government forces.
Government and rebels pledged yesterday to halt fighting within 24 hours and end five weeks of bitter conflict that has left thousands dead, but both sides have said they doubt the other can fully control the forces on the ground.
At sunset, Aguer said the country remained calm, with the ceasefire starting at 1730 GMT.
Koang alleged that South Sudanese government troops- as well as Ugandan soldiers and rebels from neighbouring Sudan's war-torn Darfur region, the Justice and Equality Movement (JEM)- had attacked rebel positions, warning they had the "right to defend themselves against this senseless aggression."
The ceasefire agreement was signed late yesterday in the Ethiopian capital Addis Ababa by representatives of South Sudan's President Salva Kiir and rebel delegates loyal to ousted vice president Riek Machar, and was greeted by cheers from regional peace brokers and diplomats.
US President Barack Obama, whose country provided crucial backing on South Sudan's path to statehood, described the deal as "a critical first step toward building a lasting peace".
UN chief Ban Ki-moon praised mediation efforts and called on both sides to "immediately implement" the agreement.
Kiir urged those rebels not under Machar's control to also respect the deal.
"Now that people have fought, people should come back to their senses and we sit down so that we can resolve this conflict through negotiation," Kiir said in address today.
Up to 10,000 people are believed to have been killed in the fighting pitting forces loyal to Kiir against a loose coalition of army defectors and ethnic militia nominally headed by Machar, a seasoned guerrilla fighter.
The fighting has been marked by atrocities on both sides with some 700,000 people forced from their homes in the impoverished nation.
