[originaltext] Gen Badrodin Haiti, the national police chief, said Sunakim an

Gen Badrodin Haiti, the national police chief, said Sunakim and one other attacker had both been convicted criminals. Jakarta’s chief of police, Insp Gen Tito Karnavian, said a hunt was under way for terror cells believed to be behind the attack.
   Three men were arrested near Jakarta early on Friday, police told local media A police spokesman, Anton Charliyan, confirmed on Friday that those who organised the attacks were associated with IS.
   Two of the criminals, he added, were "known to have committed similar radical activities some time ago". Earlier, Bahrum Nairn, an Indonesian believed to be fighting with IS in Syria, was named as the suspected co-ordinator.
   Insp Gen Karnavian said Nairn’s "vision" was to unite various IS-supporting groups across South East Asia. IS released a statement saying it had targeted citizens of countries which are part of the international alliance fighting the group, which controls parts of Syria and Iraq.
3. When were the three attackers arrested?
4. What was the Bahrum Nairn’s vision?