Eritrea has rejected Ethiopian claims it trained the rebels who plotted to carry out bombings during an African Union summit in Addis Ababa in February. Ethiopia routinely accuses Asmara of supporting rebel groups, and declared in April it would support Eritrean guerrillas fighting to overthrow President Isaias Afewerki. Both sides have often traded tough rhetoric since their 1998-2000 border war, which killed around 80,000 people and left the frontier demarcation unresolved.