The Australian Federal Police and the FBI have assisted Indonesia's efforts to quell terror-related violence before it occurs.

Nine suspected terrorists, including some allegedly planning an attack in December, were arrested in raids across five Javan cities in Indonesia following information provided by the AFP and FBI.

Indonesian police officers from Special Detachment 88 anti-terror unit raid a hideout used by suspected militants' in Mojokerto, East Java. Credit:AP

"The AFP and FBI have been working together with the Indonesian National Police, sharing threat reporting," an AFP spokesperson said.

"This reporting has been used by the Indonesian National Police to shape their investigations."