The Office of the President on Friday accused SPLM/A in opposition of attacking and killing sixteen civilians in Twic Mayardit County of Warrap State.
Presidential Press Secretary Ateny Wek Ateny said the heinous killing of innocent civilians including pregnant woman on Monday shocked President Salva Kiir Mayardit.
He added that the attackers removed twin foetus from the pregnant woman and tied them up with her intestines.
The Press Secretary said the presidency regretted the deadly attack at Adama village of Twic Mayardit County.
He assured citizens that government forces were on high alert against other possible attacks, urging residents not to revenge the killing against Nuer IDPs from Unity State in the area.
Mr Ateny registered sincere condolences of the presidency to the bereaved families of victims and Warrap government for the unfortunate loss.
Opposition forces could not be reached for comment on the allegation.