Indonesian police announced Saturday they had arrested a man they believe financed the deadly Jakarta attacks, alleging the suspect received the funds from the Islamic State group (IS).

National police chief Badrodin Haiti said twelve suspects had been detained in nationwide raids since Thursday's attacks, including one accused of bankrolling the suicide bombings and shootings that left seven dead.

"One of the people detained had received financial transfers from ISIS to fund the operation," he told reporters, using another acronym for IS.