UNITED NATIONS (Reuters/AFP) - Sudan and its neighbour Chad accused each other on Friday of aiding rebels determined to topple their respective governments as fears grew that a new peace deal signed by Khartoum and NDjamena could collapse. The two countries signed an agreement in Doha this week in which they agreed to normalise relations and reject any support for rebel groups hostile to either of them. Chads UN Ambassador Ahmad Allam-mi told a special meeting of the UN Security Council that his country had been misled by Khartoum into thinking that its neighbour would no longer support rebels intent on toppling his government. I have just arrived from Doha where, once again, I was naive enough to hope that the regime in Khartoum had decided to put an end to its attacks on my country, not to speak of its attempts to subvert or counter our policy to consolidate rule of law and democracy, he said. This, Allam-mi said, had happened before. Before the ink is even dry we are attacked by forces coming from Sudan, he told the 15-nation council. Sudanese Ambassador Abdalmahmoud Abdalhaleem rejected the allegations of backing Chadian rebels, saying the attacks were an internal problem that Khartoum had no connection to. We have nothing to do with that, he said. This is a Chadian problem. It should be dealt with inside Chad by the Chadians. Abdalhaleem reiterated Khartoums belief that NDjamena was supporting rebels in Sudans western Darfur region who attacked the Sudanese capital on May 11, 2008. Meanwhile, Chad government forces fought desert battles Friday against rebels who were stepping up an offensive against President Idriss Deby, with at least 247 people, including 225 rebel commandants killed in two days of conflict, the governments spokesman said. The fighting, centred on the eastern town of Am-Dam, has heightened concerns among UN agencies and aid groups caring for about 450,000 refugees from Sudan and the Central African Republic. Chad has bombed the rebels from planes and helicopters since they crossed the Sudanese border Monday. The government accuses Sudan of backing the Union of Resistance Forces (UFR) rebels, who have vowed to take the capital Ndjamena. The rebels, who claim to have more than 1,000 all-terrain vehicles to carry their forces across the desert, said several dozen government troops had been killed or wounded and tanks destroyed in clashes early Friday around Houaich, near Am-Dam. The fighting spared Abeche, some 600km east of the Chadian capital, and Goz Beida, a town about 100km south of the battlegrounds. Both are bases for relief agencies, and Abeche is the eastern headquarters for the Chad army. The rebels say they occupy Am-Dam, which is about 100km south of Abeche. A UN military mission deployed in Chad and the neighbouring Central African Republic to protect refugees and oversee the safety of aid work was considering the redeployment of relief staff withdrawn from camps earlier in the week, a spokesman said. The situation seems to be growing stable around Goz Beida, where the UN stepped up military patrols this week, Michel Bonnardeaux, the spokesman for the MINURCAT mission, told AFP. Everything seems to be getting back to normal. Were seeing to what extent we can redeploy. Meanwhile, MINURCAT has stepped up military patrols during the past week. Bonnardeaux and staff at the Office for the Coordination of Humanitarian Affairs (OCHA) in Geneva said that essential relief work was continuing in the region for more than 250,000 refugees from Sudan, 166,000 displaced Chadians and local people. Chads Interior Minister Ahmat Mahamat Bashir has accused Sudanese President Omar El-Bashir of ordering mercenaries to attack Chad and vowed the rebels will be wiped out.