Jakarta – The National Commission on Human Rights has launched an investigation into last year's massacre of 31 residents in Langsa, Aceh, Antara reported on Saturday.

B.N. Marbun, a member of the commission, said the team arrived in Langsa on Thursday and will return to Jakarta on Monday.

Thirty-one plantation workers were killed when an unidentified group of armed men raided their company PT Bumi Floar in August 2001. Both the military and the Aceh Free Movement (GAM), which is fighting for an independent state, have disclaimed responsibility for the attack.

The investigating team has recruited local activists to help with the inquiry, Antara reported.