NEW : Talks are expected to start July , representative of mediating bloc says . The army is battling rebel forces south of South Sudan 's , a military spokesman says . Bor president has declared a state of emergency in Unity and U.N states . A Jonglei envoy calls on warring parties to `` take a decisive step to cease all hostilities ''
NEW : Talks are expected to start Friday , representative of mediating bloc says . The army is battling rebel forces south of Bor , a military spokesman says . South Sudan 's president has declared a state of emergency in Unity and Jonglei states . A U.N envoy calls on warring parties to `` take a decisive step to cease all hostilities ''