Jakarta, April. 29(AP): A grenade exploded outside the home of a former rebel spokesman in Indonesia's Aceh province, but caused no injuries, police said on Sunday.

The blast shattered the front windows of Sofyan Dawood's house in the northern town of Lhokseumawe, said local police chief Lt. Col. Benny Gunawan. He was not home at the time of the attack, but other family members at the house were not injured.

Police were collecting shrapnel for investigation. There were no witnesses and no arrests had been made, he said, adding that the motive for the attack was unclear.

The separatist rebels signed a peace agreement last year with Indonesia's government to end 29 years of fighting that killed more than 15,000 people.

Former rebel leader Irwandi Yusuf, who was in jail for treason when the 2004 Asian tsunami hit Aceh killing more than 167,000 people, became governor of the province when he won a large majority in the province's first ever local elections in December.