Indonesian police officers stand guards at the smoke grenade explosion site in Jakarta, Indonesia, Dec. 3, 2019. An explosion resulted from a smoke grenade took place in Indonesia's National Monument Park (Monas) near the presidential palace in central Jakarta on Tuesday, injuring two soldiers, Jakarta Police Chief Inspector General Gatot Eddy Pramono said. (Photos: Xinhua)

Indonesian police officers collect some evidences at the smoke grenade explosion site in Jakarta, Indonesia, Dec. 3, 2019. An explosion resulted from a smoke grenade took place in Indonesia's National Monument Park (Monas) near the presidential palace in central Jakarta on Tuesday, injuring two soldiers, Jakarta Police Chief Inspector General Gatot Eddy Pramono said.

Indonesian police officers stand guards at the smoke grenade explosion site in Jakarta, Indonesia, Dec. 3, 2019. An explosion resulted from a smoke grenade took place in Indonesia's National Monument Park (Monas) near the presidential palace in central Jakarta on Tuesday, injuring two soldiers, Jakarta Police Chief Inspector General Gatot Eddy Pramono said.