Police issued this photo fit of Dulmatin after the 2002 Bali bombs

Accused of helping plan and execute the bomb attacks in Bali in 2002, he has so far evaded capture and is currently believed to be living in the Philippines.

While he has long been on Indonesia's most wanted list, he now appears to be an important target for the US as well.

A US offer of a $10m reward for information leading to his death or arrest indicates just how influential officials believe him to be.

Washington gave the same amount of money to Thailand in 2003, for its part in the arrest of Hambali - dubbed by the Central Intelligence Agency as the "Osama Bin Laden" of South East Asia.

Electronics expert

An Indonesian national born in central Java in 1970, Dulmatin originally worked as a car salesman.

The exact time he became interested in militant activity is unknown, but he is widely believed to have been the protégé of Azahari Husin, one of the suspected masterminds of the 2002 Bali attacks and other bombings in the region.

If Noordin and Azahari are the two most wanted men in Indonesia... Dulmatin and Umar Patek are probably the two most wanted men in the Philippines Sidney Jones, ICG

Dulmatin is not thought to have had any formal scientific training, but he appears to have gained significant technical skills, supposedly under the guidance of Azahari.

According to the Asia Pacific Foundation, the two men are among the few JI militants able to assemble and explode large chlorate and nitrate bombs.

Dulmatin is also known to have attended a militant training camp in Afghanistan, returning to Indonesia in the mid 1990s, where he is thought to have been a regular visitor at an Islamic school in Solo founded by Abu Bakar Ba'asyir, the man alleged to be JI's spiritual leader.

Ba'asyir is currently in jail, having been found guilty of conspiracy for giving his approval for the 2002 Bali attacks.

Dulmatin first became internationally known when named as a key suspect for the bomb attacks at two nightclubs in Bali on 12 October 2002.

A total of 202 people died in the attacks - many of whom were foreign tourists.

He is believed to have set off one of the bombs with a mobile phone, as well as making explosive vests for a suicide bomber and working alongside Azahari to assemble the massive car bomb used in the attacks.

Philippine troops are trying to flush out Abu Sayyaf militants

In fact, since 2003 he is believed to have been based in the southern Philippines, involved in training other militants at secret camps.

Earlier this year, he was thought to have been killed in a targeted air strike by the Philippine military.

But the latest information suggests he is still alive, on the island of Mindanao, the main location of the Philippines' own separatist insurgency.

According to regional analysts, there are fears that Dulmatin and other JI operatives, notably Umar Patek, have formed an alliance with the Abu Sayyaf, the smallest and most radical of the Islamic separatist groups in the southern Philippines.

According to the Asia Pacific Foundation, Abu Sayyaf is thought to provide protection and assistance to JI, while JI provides bomb-making expertise and training in return.

"If Noordin and Azahari are the two most wanted men in Indonesia... Dulmatin and Umar Patek are probably the two most wanted men in the Philippines," Sidney Jones, an analyst from the International Crisis Group, wrote in September.