An explosion of a smoke grenade on Tuesday, December 3rd in the heart of the Indonesian capital injured at least two military personnel, Reuters has reported citing Jakarta’s police chief.
The blast, at 7:15 am local time (0015 GMT), took place at a park near Indonesia's presidential palace, however, President Joko Widodo was not at the palace at the time, according to a presidential spokesman.
Jakarta police chief Gatot Eddy Pramono told a televised news conference the explosion was thought to have been caused by a smoke grenade, without confirming if it was the result of a sectarian attack.
"We haven't concluded so, because we're still investigating."
Jakarta military chief Eko Margiyono told reporters that the explosion injured two military personnel, one on the hand and the other on the leg. Margiyono added they were there for exercise and were immediately taken to hospital.
"A smoke grenade was found and we're looking into why it was there," Margiyono said, in comments aimed at reassuring the public that described the incident "as not so extraordinary".
Indonesia, the world’s most populous Muslim-majority country, has recently suffered a spike in homegrown militancy in recent years.
Last month, an attack linked to the Isis-inspired Jamaah Ansharut Daulah (JAD) wounded six people after a 24-year-old university student blew himself up outside police headquarters in the Indonesian city of Medan.