Separatist rebels and the military in Indonesia's Aceh province have accused each other of responsibility for a bombing which killed 11 people at a New Year's Eve concert in the province.

The military says one of the dead has been identified as Syaiful Amri, an active Free Aceh Movement (GAM) member. It says Amri, 25, died when the bomb he was handling exploded prematurely at Peureulak in East Aceh.

GAM said Syaiful had been captured by the military three days before the blast and had been brought to the scene to discredit their movement.

"Like many other bloody incidents, the TNI [armed forces] has engineered more killings just to make us look bad," Teungku Mansoor, the rebel spokesman for the Peureulak area, told AFP in Jakarta.

"Syaiful, who carried an Indonesian ID card under the name of Abdullah Usman, was arrested in Banda Aceh on December 28. How can he prepare and conduct the bombing from detention?" GAM's operations commander for the Peureulak area, Ishak Daud, said he believed Amri had been brought to the concert without being told a bomb was about to explode.

The military denied Syaiful had been arrested before the blast. "He [Mansoor] can say whatever he wants, the fact is we had not arrested Syaiful as he has claimed," said provincial spokesman Ahmad Yani Basuki Aceh police spokesman Sayed Husainy said Syaiful's body was believed to have been closest to the explosion "but we cannot say whether it was an accident or a suicide bombing."

The military is mounting an all-out offensive to crush separatists in Aceh, where GAM has been fighting for independence since 1976. The bomb, which was placed under the stage, was the worst bomb attack in years in the province. A one-year-old baby girl and a seven year-old boy were among those killed. Most victims of the separatist war, which has claimed an estimated 12,000 lives since 1976, have been civilians.