"The type of rockets which we have now - and some of them did not explode - we have the codes, we have seen the planes directly, this is recorded, and all this evidence we are going to take to the [UN] Security Council."
Woman is shackled to six-month-old baby in jail after she is found guilty of adultery.
The United Nations mission in South Sudan has confirmed that a UN peacekeepers' camp was among targets bombed by Sudanese warplanes amid border clashes between the two countries' armed forces.
George Clooney has been arrested for civil disobedience during a demonstration outside Sudan's embassy in Washington DC on Friday.
While South Sudan celebrates its independence today its former allies north of the new border in the Nuba mountains are living a nightmare.
In a statement, Mr Obama said: "If the government of Sudan acts to improve the situation on the ground and to advance peace, there will be incentives.