The International Crisis Group says rising tensions between Christians and Muslims in Indonesia's troubled Maluku province could lead to a return of the communal fighting that left some 9,000 people dead there a decade ago.

The Brussels-based think-tank, in a warning Tuesday, said the Jakarta government must take urgent steps to establish the causes of Christian-Muslim rioting last month in the city of Ambon. It said a probe must establish how and why the violence started. Additionally, the statement said the government must move to rebuild homes destroyed in the fighting and address the needs of displaced persons.

The latest violence was sparked by the September 10 death of a Muslim motorcycle taxi driver. Police say the victim died in a collision, but rumors quickly spread that he had been tortured and killed by Christians. At least three people were killed and scores wounded in two days of clashes, before troops were dispatched to quell the unrest.

Maluku province, once known as the Spice islands, has been largely peaceful since 2002, after three years of deadly communal fighting.