13 January 2012 Last updated at 20:47 GMT
In South Sudan, more than fifty people, mostly women and children, were killed on Wednesday in continuing tit-for-tat attacks and cattle raids between the Lou Nuer and the Murle people in the state of Jonglei.
Aid agencies say more than 60,000 people have fled the violence and are in urgent need of humanitarian assistance.
Kevin Mwachiro reports from Nairobi.
- VIDEO: South Sudan violence continues (bbc.co.uk)
- South Sudan: 47 killed in revenge attack as tribal conflicts escalate (telegraph.co.uk)
- 47 die in another round of S.Sudan tribal violence (seattletimes.nwsource.com)
- Scores killed in revenge attacks in South Sudan (cnn.com)
- South Sudan clashes kill dozens (bbc.co.uk)
- 57 Killed in Tribal Revenge Attack in South Sudan (abcnews.go.com)
- Scores killed in revenge attacks in South Sudan – CNN International (edition.cnn.com)
- Children among 57 killed in South Sudan tribal clashes (thehimalayantimes.com)