The New York Times says there is evidence Sudan is flying arms and military equipment into Darfur in violation of U.N. Security Council resolutions.
The newspaper Wednesday reported highlights of what it said is a confidential United Nations report on compliance with the resolutions.
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The Times said Sudan's government is transporting the cargo in military planes painted white to disguise them as U.N. or African Union aircraft. It says the planes are also being used for aerial surveillance and the bombardment of villages.
The report did not say who Sudan is arming but the government has been widely accused of supporting Arab militia groups blamed for many atrocities in Darfur.
The report came out two days after Sudan agreed to allow about 3,000 U.N. peacekeepers in Darfur, to strengthen an existing African Union force.
Some diplomats have expressed skepticism about whether Sudan will carry out the agreement.
Fighting in Darfur has raged since 2003, when rebels began an uprising against the Sudanese government. The violence has killed an estimated 200,000 people and displaced more than two million others.
The U.N. report said the rebel groups are also guilty of violating Security Council resolutions. It recommended a general tightening of the U.N. arms embargo on Darfur.