JAKARTA, Indonesia -- A suspected suicide bombing near a bus terminal in Indonesia's capital Wednesday night killed a policeman and injured four other officers, police said.

Vice National Police Chief Syafruddin, who uses one name, said an initial investigation showed that the suspected suicide bomber also died in the blast.

"Tonight, to Indonesian citizens and all of us who are here at the scene, I express very deep concern. A bomb explosion has occurred and for now it is believed to have been a suicide bombing," he said.

A police officer stands guard near the site of an explosion in Jakarta, Indonesia, on Wed., May 24, 2017. AP

He said the officers had been guarding a parade by a group of local people.

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The explosion occurred in a parking lot next to the bus terminal in the Kampung Melayu area of eastern Jakarta. The injury toll was unclear, with broadcaster TV One reporting that two civilians including a female student had been wounded.

A police bomb squad was investigating the explosion.

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 country, generally follows a moderate form of the faith.

In January 2016, militants associated with an Indonesian group affiliated with the Islamic State of Iraq and Syria (ISIS) killed four people and wounded more than 20 others in a brazen attack outside a Starbucks in the Indonesian capital. The extremist group claimed responsibility for that attack, which resembled the 2015 attacks in Paris that left 130 people dead.