Sudan recognised South Sudan as an independent country when it broke away from Khartoum on July 9 this year after a referendum agreed under a 2005 peace agreement. But tensions have risen since then as north and south blame each other for violence on both sides of their poorly-marked border. They have also failed to agree how to share oil revenues and find a solution for the disputed region of Abyei. On Saturday, a spokesman for the foreign ministry said Sudan had submitted a fresh complaint against South Sudan to the Security Council accusing it of supporting rebels in the two northern border states of South Kordofan and Blue Nile. South Sudan "continues providing (rebels) with anti-aircraft and anti-tank missiles as well as with ammunition, landmines and mortars," the foreign ministry said in a statement carried by state news agency SUNA. Sudan filed a similar complaint in August. The Sudanese army has been fighting for months against rebels of the northern wing of the SPLM in both states. The SPLM is the ruling party in South Sudan. It denies any support for the rebels north of the border.