In a southern district of the city, clashes involving aerial bombardment, artillery and machine gun fire were continuing, according to Reuters.
"The secretary general raised in the strongest terms the continued killings, massive destruction, human rights abuses, and aerial and artillery attacks committed by the government," it said.
In a statement, the State Department condemned "Sudan's military incursion into South Sudan" on Sunday, saying that Sudan "must immediately halt the aerial and artillery bombardment in South Sudan".
Earlier, UN Secretary-General Ban Ki-moon met with Mr Moualem and strongly criticised the Syrian government for killings, rights abuses, aerial and artillery attacks.
Because of the incessant aerial bombardment, artillery shelling and mortar shelling, I just stay inside at the orphanage or at home.
Even with the aerial surveillance, artillery, and air power employed to minimize risks, Afghanistan has remained a dangerous place for U.S. forces.
The city suffered heavily in the Civil War, with two years of aerial and artillery bombardment and combat lines drawn up as close as University City in western and northwestern Madrid.
The Islahiye camp is a place of hatred and defiance, a concentration of families who say they have been chased from their homes not just by rifles and government troops but also by indiscriminate aerial and artillery barrages.
The Tamil Tigers have been widely accused by, among others, international aid agencies, of prohibiting civilians from leaving the area, which has been bombarded by aerial attacks, artillery shelling and even cluster munitions.
That led to aerial and artillery attacks on suspected militant hideouts in Upper Orakzai region which went on for several hours, the official said, killing more than 30 militants.
