As politicians fail to reach an agreement on forming a transitional government in South Sudan, there's concern over the formation of a new armed group in the oil rich state of Upper Nile.
 
The Maban Defence Force has killed a number people working for aid agencies, highlighting fears that other groups may follow their lead.   
 
Al Jazeera's Anna Cavell reports from Bunj town in South Sudan.

Source: Al Jazeera