The US will cut exports to Sudan and lines of government credit after determining that banned weapons were used.

"The United States calls on the government of Sudan to cease all chemical weapons use and uphold its obligations under the CWC," the statement read, referring to the Chemical Weapons Convention under which signatories have committed to destroy their stockpiles of the weapons.

The announcement came shortly after the Sudanese Army announced that it had pushed the Rapid Support Forces paramilitary out of the capital, Khartoum.