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Government helicopter gunships were seen over Juba on Monday
Renewed fighting has broken out in South Sudan between forces loyal to the president and vice-president.
A reporter in the capital, Juba, told the BBC gunfire and large explosions could be heard all over the city. He said heavy artillery was being used.
More than 200 people are reported to have died in clashes since Friday.
Chinese TV showed pictures of an injured peacekeeper receiving treatment
The latest violence came hours after the UN Security Council called on the warring factions to immediately stop the fighting.
In a unanimous statement, the council condemned the violence “in the strongest terms” and expressed “particular shock and outrage” at attacks on UN sites. It also called for additional peacekeepers to be sent to South Sudan.
Residents of Juba have told the BBC they are staying indoors amid the sound of gunfire from the streets.
“Soldiers are now looting some property,” charity worker Ladu David Morris said. “They pretend to be patrolling but once they notice that no people are inside they break in.”
Questions of command: James Copnall, BBC South Sudan analyst
The peace deal signed last August brought the two rival military forces together in the capital Juba. Even at the time this looked risky.
Perhaps if political progress had been made since Riek Machar returned to Juba in April, tensions between the forces could have been smoothed over, but the implementation of the peace agreement stalled. Each side clearly regarded the other as an existential threat.
Riek Machar seems to be in a weaker position right now: he has 1,300 soldiers, and some police, but no air power, tanks or heavy weapons – unlike his rival. There must also be questions about how much ammunition Mr Machar’s troops have.
Another key question: to what extent are Salva Kiir and Riek Machar in command? Both called for calm on Friday, but the fighting still continued. And will the fighting spread beyond the capital? The longer this lasts, and the further it spreads, the harder it will be to stop it.
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.
The latest round of violence erupted when troops loyal to President Salva Kiir and first Vice-President Riek Machar began shooting at each other in the streets of Juba.
On Monday, there were reports of tanks on the streets of Juba and clashes close to the airport and UN camps sheltering civilians. The US embassy warned of “serious fighting” taking place.
A BBC correspondent in the Kenyan capital, Nairobi, said it was not clear if Mr Kiir and Mr Machar remained in control of their forces.
On Monday afternoon, soldiers loyal to Mr Kiir were ordered back to barracks, a spokesman for the force told the BBC. However, he did not comment on whether this meant the fighting was over.
BBC