At least five Ugandan businessmen were Monday evening killed in an ambush following continued clashes between forces loyal to South Sudan President Salva Kiir and those of his deputy Riek Machar.
This brings to seven the total number of Ugandans who have so far died in the clashes that broke out last Friday in the youngest African nation.
Several Ugandans are still trapped in Juba following the clashes.
Eye witnesses, they were ambushed by militias at Aruu junction inside South Sudan at around 4pm on Monday.
They said vehicle said to be carrying 10 employees of telecommunication company MTN was ambushed while coming from Juba to Nimule towards the border point of Elegu.
The attack on Ugandans happened just hours after President Kiir who is reportedly in South Africa declared a cease fire of the warring parties.
Kiir called on commanders of the warring parties to lay down their guns and call a truce.
Meanwhile, the clashes are a serious setback to peace deal that Kiir and Machar signed following pressures from the western countries.
UN Secretary General Ban Ki-moon yesterday said an arms embargo be imposed on the South Sudan to avert further killings.