"As a follow up of the case, our team has arrested eight suspects," Tito said in his visit to Riau Police headquarters here on Thursday.
However Tito did not elaborate further the location of the arrest as well as the suspects` identity.
The police has continued to trace the alleged terrorists` networking he said.
However, Tito believed that the perpetrators of the attack in Riau police headquarters belonged to the same group with the suspects in previous attacks in the police Mobile Brigade in Depok and Surabaya police headquarters, Jamaah Ansharut Daulah (JAD).
"I have said before, all the (terror) attacks were launched by Jamaah Ansharut Daulah. I can point a finger to them after during the past 3-4 years we saw development of the group," he added.
Four suspects were killed in the incident on early Wednesday. All the victims came from Dumai.
Following the incident, Dumai police has conducted thorough search in five locations and arrested some individuals. But there is no further information on their identities.
Reported by Anggi Romadhoni
Editor: Heru Purwanto
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