Jakarta – Two human rights workers detained in Indonesia's Aceh province have reportedly been beaten up by security forces while in custody and may face further torture or ill treatment, Amnesty International said.

The London-based organisation, in a statement received here Monday, said Husni Abdullah, 26, and Mahyeddin, 23, were members of the People's Crisis Centre, a humanitarian organisation which helps Acehnese forced from their homes during the separatist conflict.

It said they were arrested on December 15 and have been accused of belonging to the Free Aceh Movement (GAM), a guerrilla group which has been fighting for independence since 1976.

"Both men have reportedly been beaten while in detention. Husni Abdullah has reportedly lost some of his teeth as a result of being beaten with both hands and rifle butts," Amnesty said, urging its members to raise the cases with Indonesian authorities.