The suspects from South Sumatra have been taken by national police to Jakarta for further interrogation and efforts to determine their exact plans and connections, the official Chinese news agency Xinhua reported Thursday.

"We still do not know who they are and to what networks they belong because they were arrested only yesterday," said police spokesman Gen. Abubakar Nataprawira.

In a Wednesday raid on a house in Palembang, police allegedly discovered and seized eight partly assembled bombs, 13 fully built-up bombs and 50 kilogram of explosive materials.

The men allegedly first planned to attack foreign tourists on Sumatra Island. But they later decided to target Jakarta instead after realizing too many Indonesian lives could have been lost, Indonesian TV One quoted anti-terror police as saying.