JAKARTA - The Islamic State group issued a cryptic warning before multiple blasts hit the Indonesian capital Jakarta on Thursday, killing at least four people, police said.
National police spokesman Anton Charliyan said it was not clear yet which group had carried out what the Indonesian president has termed "acts of terror".
But he said that IS issued a cryptic warning before the attacks.
"The warning said there will be a concert in Indonesia and it will be international news," he told a local radio station.
He did not give any further details, or say when the warning was issued.
Police foiled several terror plots in Indonesia last month, with some believed to be linked to IS. Hundreds of Indonesians are feared to have joined the extremist group, which has taken over vast swathes of territory in Iraq and Syria.
Another video by @PujionoJS catches Jakarta gunman on camera pic.twitter.com/OnUdcvd4ru— Khalid Khan™ (@khalidkhan787) January 14, 2016
#Breaking video: The Moment when blast taking place in Central #Jakarta Indonesia via @khalidkhan787 pic.twitter.com/DV2kgpY67y— R.Saddler (@Politics_PR) January 14, 2016
ABC Indonesia correspondent @samanthahawley reports live from #Jakarta bomb blasts: https://t.co/cKWsrL106R— ABC News 24 (@ABCNews24) January 14, 2016
More photos post sarinah bomb a few min ago. Apparently shooting going on. #Jakarta. pic.twitter.com/Uhvkky2m70— Edward Rees (@ReesEdward) January 14, 2016
#UPDATES: Explosions in Indonesian capital #Jakarta, gunfire heard and casualties seen https://t.co/YRZ5EnmM8V pic.twitter.com/KtwrYhO6E6— 7News Yahoo7 (@Y7News) January 14, 2016
Not okay to tweet photos of dead bodies on the street. #jakarta— Ben Ben BENNNNN (@iB3nji) January 14, 2016
#Indonesia television showing images of #Jakarta bombings at police office. pic.twitter.com/6k8DZYSpGn— Natasha Fatah (@NatashaFatah) January 14, 2016
The attacked #Jakarta checkpoint is just down the street from the UN Information Center. pic.twitter.com/Skye2pJDd3— Alejandro Alvarez (@aletweetsnews) January 14, 2016