The National Police's counterterrorism unit, Densus 88, arrested two bomb makers in Central Java on Tuesday.
National Police spokesperson Brig. Gen. Boy Rafli Amar said that the bomb makers, identified as Samidi alias Arifin and Slamet Pilih Utomo, were believed to have links with Badri Hartono, who planned an attack in Surakarta, Central Java, last year.
"Densus 88 arrested Samidi in Bancarkembar, Purwokerto, and Slamet in Surakarta. They are known as nitroglycerin bomb experts," Boy said in Jakarta on Tuesday.
"We confiscated some of their nitroglycerin bomb-making materials when we arrested Badri last year," Boy added.
"Badri's group is connected to Santoso. Both of them were involved with terrorist paramilitary training in Poso, Central Sulawesi," Boy said, referring to the Poso terror mastermind who is now on the run.