The State Intelligence Agency says it is monitoring friction between supporters of the three rival presidential campaign camps but adds that the situation is under control.

"We have noticed increasing tensions but it is something that is common during an election campaign period," Syamsir Siregar, the head of the agency also known as BIN, said on Monday.

He urged the campaign teams to refrain from attacking each other "personally" to curb potential unrest. Overall, Syamsir said he expected the July 8 presidential poll to run smoothly, and BIN has yet to detect any serious security threats that may disturb the election.

"Everything remains secure, so far," he told reporters on the sidelines of a BIN meeting with the House of Representatives commission that handles defense and foreign affairs. "We remain alert on certain areas that are prone to conflict like Papua and Aceh."

Security in Papua has deteriorated during the election season. Coordinating Minister for Political, Legal and Security Affairs Widodo Adi Sucipto recently announced the deployment of two Mobile Brigade platoons to the troubled area.

Syamsir said BIN would not be directly involved in securing polling stations.