At least three people, including a woman and her grandson, were killed in the latest violence in the troubled Indonesian province of Aceh, witnesses and the military said.

The 65-year-old woman and her seven-month-old grandson were killed on Sunday when unknown gunmen fired into their home in North Aceh's Lueng Tuha village, a witness told reporters. The parents of the baby were wounded in the attack.

A spokesman for the Free Aceh Movement (GAM) separatist group, Teungku Jamaica, blamed government soldiers for the killings. He said the soldiers had gone on a rampage in the village following a GAM-led attack on troops patrolling the area. The district's military spokesman, Major Zaenal Mutaqin, said he would investigate Jamaica's allegation.

Another civilian was killed in the Blang Ara area of Central Aceh on Saturday when he was assaulted by at least 10 rebels who also stole his money, Mutaqin said.

Aceh has long been the scene of bloody violence involving government forces and armed rebels from the separatist movement – which has been fighting since 1976.

More than 10,000 people, mostly civilians, have been killed in Aceh in the conflict, with rights activists estimating the toll for this year alone at around 1,000.