The 14-year-old, Mehmet Salih Ekinci, died in hospital in Ankara, where several injured were taken after the January 3 attack in Diyarbakir, the Final private school here said.

Five other victims were also teenagers attending classes at Final, near which the car bomb went off.

A suspected member of the separatist Kurdistan Workers' Party (PKK) was charged over the bombing, along with six others who allegedly helped him organise the attack.

Police say the man confessed to detonating the remote-control bomb in retaliation for Turkish air strikes on PKK camps in neighbouring northern Iraq since mid-December.

The intended target was a military bus passing by with several dozen soldiers on board. About 30 officers were among the 66 people injured.

The PKK, listed as a terrorist group by Ankara and much of the international community, has apologised for the attack and put the blame on Kurdish militants acting without the approval of the leadership.

The group has waged a bloody campaign for self-rule in mainly Kurdish southeast Turkey since 1984. The conflict has claimed more than 37,000 lives.