Sudan has accused Chadian aircraft of bombing its western Darfur region in what it called "repeated aggressions" by its western neighbor, according to a report of Reuters. Relations between the two African oil producers have been touchy in recent years as both try to quell insurgencies close to their long and porous border. "In an unprecedented escalation, Chadian forces have violated the joint border as three Chadian war planes bombed two areas...in West Darfur ... on Dec. 28," said a Sudanese foreign ministry statement on Sunday. A European force is due to deploy to eastern Chad to support a large U.N.-AU peacekeeping force in neighboring Darfur and stem the violence there, which has crossed the border.