Gunfire broke out on Thursday for a second day on the border between Rwanda and the Democratic Republic of Congo, a Congolese official said, after months of relative calm in the volatile region. Congolese and Rwandan officials each accused the other's armies of mounting cross-border raids on Wednesday that prompted heavy fire between the two forces. Reports suggested the gunfire on Thursday morning was short-lived. U.N.-backed Congolese troops crushed an uprising last year in eastern Congo, a mineral-rich area plagued by years of war. "There were some shots fired but very few. It has already finished," Congo's North Kivu governor, Julien Paluku, said. "The shots came from the Rwandan troops, our forces did not respond. They have clear instructions not to shoot unless the situation becomes very serious. We are not at war with Rwanda," he told Reuters by telephone.