Amy Chew reporting from Jakarta

NEW terror cells are emerging and planning attacks in Indonesia after the death of Malaysian Noordin Mohammad Top.

A senior ranking officer from Indonesia's anti-terror task force said new terror cells continue to be set up despite the huge blow inflicted on them with over 400 members arrested and scores shot dead.

"Terrorists still exist. They are undergoing training and are still planning attacks," Usman Nasution, chief of Detachment 88 (Den88), told a counter-terrorism seminar.

Nasution said said many terrorists involved in the country's bomb attacks have yet to be caught.

The seminar was organised by the country's largest Muslim organisation, the 40-million strong Nahdlatul Ulama (NU), to counter radicalism.

Den88 is a special anti-terrorist task force responsible for investigating and cracking down on terrorists' activities in the country.

It was set up shortly after the Bali bombings which killed 202 in 2002.

Noordin was shot dead in Solo, Central Java on Sept 17 this year after an exhaustive hunt by police which lasted six years.

He was the mastermind behind the twin bombings of the J.W. Marriott and Ritz Carlton hotels in Jakarta which killed nine people last July 17.

He was a key member of the regional terror group, Jemaah Islamiayh (JI) until he broke away to form a more hardline faction in 2003.

Nasution said it was possible another militant may have taken over as emir of Noordin's cell following his death.

From 2002-2009, Indonesia's anti-terror police arrested 454 militants, said Nasution. Of the number, 352 were charged and sent to jail.