Grisly images of scattered body parts emerged after the explosions, a few minutes apart, occurred at a Trans Jakarta bus stop near the Kampung Melayu terminal in East Jakarta around 9pm local time.

National police spokesman Setyo Wasisto said five police officers and five civilians had also been injured in the attack.

No-one had yet claimed responsibility for the explosions.

Mr Setyo told Fairfax Media the two explosions took place between the bus terminal toilet and parking lot.

Police had been providing security for a torch parade to celebrate the beginning of the Islamic fasting month of Ramadan, which starts within days.

"Do not be afraid, do not get scared, because if you get scared it means terrorists have succeeded," Mr Setyo said.

"Police are investigating and if God permits we will know who committed (the attack)."

Deputy national police chief Syafruddin, who was at the scene, said the type of bomb was still being investigated.

He said it was a global phenomenon that police officers were being targeted and urged the public to notify police of any suspicious activity.

He said that based on information from Indonesia's special forces counter-terrorism unit Detachment 88 the body parts are suspected to belong to the perpetrator.

Eight people were killed - including four militants - in a terror attack on January 14, 2016 in front of the Sarinah department store in central Jakarta.

In December last year Indonesia's police chief Tito Karnavian attributed a sharp rise in the number of alleged terrorists handled by his force to the influence of Islamic State and the defeats it is experiencing in the Middle East.

The number of alleged terrorists dealt with by Indonesian police in 2016 was more than double the previous year, as IS encouraged terror cells to carry out attacks beyond Syria.

Mr Karnavian revealed there had been 170 alleged terrorists processed by police in 2016, compared to only 82 in 2015.

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