The African Union on Friday voiced its concern over the deepening crisis in Burundi where the peace process is floundering and tribal tensions are resurfacing. "We express deep concern over the stalling of the implementation of the agreement signed by the Burundi government and the National Liberation Forces FNL " African Union peace and security commissioner Said Djinnit said. The deteriorating political situation in Burundi and growing fears of renewed conflict in the small conflict-scarred Central Africa nation were the focus of a meeting at the continental body s headquarters in Addis Ababa.