"Four suspects have been arrested by counter-terrorism squad Densus 88. Two more are still wanted. It is not impossible that the number will still increase depending upon the results of investigation," Head of Public Counseling of the Public Information Bureau of the Indonesia Police, Senior Commissioner Awi Setiyono, said at a press conference at the Indonesia Police Headquarter here on Sunday.
One of the four suspects arrested is a woman who is believed to be the one who would carry out bombing, he said.
Two of the male suspects known by their initials as MNS and AS were arrested at Kalimalang flyover in Bekasi at 15.40 while the other male suspect (S) was arrested in Solo, Central Java, at 18.30 on Saturday.
The female suspect known as DNY in her initials was arrested at her lodging house where the bombs were found on Saturday.
They planned to detonate the bombs at vital national objects, he said.
Awi said the police had followed MNS and AS since they left Solo in Central Java. "We followed them by car from Solo to Jakarta. They entered Jakarta at 14.00," he added.
MNS and AS then picked up DNY at Pondok Kopi, East Jakarta, for a post office to send a package.
"Densus 88 confiscated the package, taken from the post office without her knowledge. There we found clothes and a letter in which she bid farewell to her parents as she would carry out amaliyah (service)," Awi said.
From the post office the three then proceeded to a lodging house on Jalan Bintarajaya 8 in Bekasi.
"She dropped off carrying a black backpack. After that MNS and AS left. Densus 88 followed them and caught them at Kalimalang flyover. They did not defy," he said.
The police later arrested DNY and S and confiscated a rice cooker bomb kept in a black backpack as well as other items as evidence.
Awi said the suspects had been influenced by Daulah Islamiyah view regarding "amaliyah" (concrete service) and each of them had specific roles to play.
He said MNS had a role of creating a small cell and assembling a bomb along with other wanted suspects as well as carrying the bomb from Solo to Jakarta to be delivered to DNY.
AS carried the bomb from Solo to Jakarta along with MNS and rented the car to take the bomb to Jakarta and deliver it to DNY and later take the would-be bomber to a location close to a vital national object. The bomb was expected to be detonated on Sunday (Dec 11).
DNY would be the bomber and find the lodging along with MNS in Bintara, Bekasi.
S, who was caught in Karanganyar, Solo, had a role of helping assemble the bomb taken by MNS and AS to Jakarta, Awi said.
He said they would be charged against violating articles in the anti-terrorism law carrying a sentence of up to life imprisonment.
(Reported by Anita Permata Dewi and Gusti NC Aryani/Uu.H-YH/F001)