National police spokesman Setyo Wasisto yesterday said there were two explosions by two suicide bombers.
"I expressed my deep condolence, in fact three policemen were killed," Wasisto said. "There were explosions and latest investigation found that there are two suicide bombers, all men."
He added that ten other people -- five policemen and five civilians -- were wounded and were taken to several hospitals.
Earlier, Vice National Police Chief Syafruddin, who uses one name, said an initial investigation showed there were two explosions and a suspected suicide bomber had also died.
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Syafruddin said the officers had been guarding a parade by a group of local people.
The explosion occurred in a parking lot next to the bus terminal in eastern Jakarta.
A bomb squad was investigating the explosion as heavily armed police and soldiers guarded the area.
TV channels showed people helping a victim lying on the ground, and three policemen carrying another victim away from the scene.
Indonesia, the world's most populous Muslim-majority country, generally follows a moderate form of the faith.
The government has carried out a sustained crackdown on militants since the 2002 Bali bombings by al-Qaida-affiliated radicals that killed 202 people.