"The Central African armed forces attacked the outpost of Sourou in Chad on Sunday morning... killed a Chad soldier, injured five and kidnapped five others who were then executed in Mbang on the Central African Republic side," Chad's Foreign Minister Cherif Mahamat Zene said in a statement.

The Central African Republic regularly accuses its northern neighbour of supporting armed rebel groups from inside Chad.

Central African soldiers were pursuing rebels from one of the many armed groups operating in the country across the border, a senior Chad security official told AFP, speaking on condition of anonymity.

Central African authorities had not yet responded to AFP requests for comment as of Monday morning.