The police hope to track down six top leaders of militant group Jemaah Islamiah after the recent arrest of a suspected terrorist and the discovery of bomb-making chemicals, an intelligence official said today.

The suspect, Alias Osman, 36, was arrested in Kuala Lumpur on June 9 and led police to a cache of chemicals similar to the ones used in the Bali bombings in Indonesia last year which killed more than 200 people, mainly Western tourists.

He is being held as a suspected member of the al Qaeda-linked Jemaah Islamiah (JI) terror network accused of carrying out the Bali attack, the official told AFP on condition of anonymity.