A ceasefire between South Sudan's warring parties went into effect just after midnight, in what is the latest bid to end a devastating four year war. Government and several armed groups signed a ceasefire deal Thursday during peace negotiations in Addis Ababa, to begin from today.<br/><br/>The agreement says all forces should "immediately freeze in their locations", halt actions that could lead to confrontation and release political detainees as well as abducted women and children. Former vice president Riek Machar, whose falling out with President Salva Kiir kickstarted the conflict in 2013, has ordered his rebel forces to "cease all hostilities". In a statement, he said all forces should remain in their bases and to act only in self defence or against any aggression.<br/><br/>South Sudan's leaders fought for decades for independence, but once they achieved it in 2011, a power struggle between Kiir and Machar led to all out civil war. A peace deal was signed earlier, but it collapsed in July 2016 when fresh fighting in the capital Juba forced then first vice president Machar into exile. <br/><br/>Violence spread to the southern region of Equatoria, forcing over a million South Sudanese to flock to neighbouring Uganda and the Democratic Republic of Congo in what has become the biggest refugee crisis on the continent.