A security advisor to Burundi’s vice-president has been shot dead while dropping off his daughter at school.

General Athanase Kararuza and his wife died instantly, while their daughter was injured. No group has said it was behind the attack in the capital.

More than 400 people have been killed in unrest since President Pierre Nkurunziza said he would run for a third term last April.

A string of high-ranking army officials have been targeted during the conflict.

Security forces have also been accused of killing opponents and dumping them in mass graves by rights group Amnesty International.

Shortly after the attack in Bujumbura, the International Criminal court announced that it was starting a preliminary investigation into the violence in Burundi.

This will decide whether a full-blown investigation will take place, which could result in charges against those accused of being behind the violence.