Col. William Gatjiath, the military spokesperson of the opposition forces says government gunships bombarded the home of South Sudan first vice president, Riek Machar.
Col Gatjiath told BBC hundreds of SPLA-IO soldiers died Sunday during the bombardment.
He also confirmed that South Sudan was “back to war”.
Another SPLA-IO General confirmed the bombing of Machar’s compound saying the former rebel chief was still alive.
“Dr Machar’s residence was attacked twice today [Sunday] including using tanks and helicopter gunships. Helicopters from Kiir’s side attacked the residence twice,” James Gatdet Dak told Reuters, adding that he was not in South Sudan but was in contact with Machar.
The First Vice President is currently in hiding at the residence of France ambassador in Gudelle West of Juba city.
Fighting resumed this morning in the capital with SPLA gunships bombarding a base that is believed to be that of the SPLA-IO at Yei-Juba checkpoint.
Authorities at South Sudanese Ministry of Health confirmed over 270 lives have already been lost.
Government spokesperson, who also doubles as minister of information, Michael Makuei Lueth, confirmed the figures, but could not say which side was badly affected.
Chinese media say two Chinese UN peacekeepers have now died in Juba. Several other peacekeepers have been injured, as well as a number of civilians who have been caught in crossfire.
State Department spokesman John Kirby said Washington had ordered the departure of non-emergency personnel from the US embassy in Juba.
A US academic who studies Sudan, Eric Reeves, told the BBC Machar was trying to orchestrate a coup against his rival, with the backing of President Omar Bashir of Sudan.
“This has been planned,” he told BBC.
“That violence now seems to be part of a co-ordinated coup led by Riek Machar. This changes entirely the complexion of the crisis.”
A spokesman for Machar is reported to have rejected this.
Civil war broke out after President Salva Kiir sacked the cabinet and accused Vice-President Riek Machar of planning a coup in 2013.